math enrichment book

Florida Enrich BookGrade 2

PROVIDES

daily enrichment activities

Copyright by Houghton Mifflin Harcourt Publishing Company All rights reserved. No part of this work may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying or recording, or by any information storage or retrieval system, without the prior written permission of the copyright owner unless such copying is expressly permitted by federal copyright law. Permission is hereby granted to individuals using the corresponding students textbook or kit as the major vehicle for regular classroom instruction to photocopy entire pages from this publication in classroom quantities for instructional use and not for resale. Requests for information on other matters regarding duplication of this work should be addressed to Houghton Mifflin Harcourt Publishing Company, Attn: Contracts, Copyrights, and Licensing, 9400 SouthPark Center Loop, Orlando, Florida 32819. Printed in the U.S.A. ISBN 13: 978-0-15-385493-4 ISBN 10: 0-15-385493-6 If you have received these materials as examination copies free of charge, Houghton Mifin Harcourt Publishing Company retains title to the materials and they may not be resold. Resale of examination copies is strictly prohibited. Possession of this publication in print format does not entitle users to convert this publication, or any portion of it, into electronic format.

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ContentsBIG IDEA 1: Number, Place Value, and PatternsChapter 1: Place Value and Number Patterns1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Pencil Place Value ............................................................................................. E1 Expanding Numbers .......................................................................................... E2 Race to Find the Number ................................................................................. E3 Marble Mix-Up .................................................................................................. E4 Odds and Ends ................................................................................................... E5 More About Skip Counting .............................................................................. E6 A Sticky Situation .............................................................................................. E7 Whats the Problem? ......................................................................................... E8 My Predictions ................................................................................................... E9

Chapter 2: 3-Digit Numbers2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Tic-Tac-Hundred ............................................................................................... E10 Find the Number ................................................................................................ E11 Value Clues ......................................................................................................... E12 Say It in Layers ................................................................................................... E13 Find the Greater Number ................................................................................. E14 Comparing .......................................................................................................... E15 The Middle of the Train ................................................................................... E16 Find the Number Pattern .................................................................................. E17

Chapter 3: 4-Digit Numbers3.1 3.2 3.3 3.4 3.5 3.6 Brick by Brick..................................................................................................... E18 Matching ............................................................................................................. E19 4-Digit Crossword .............................................................................................. E20 Compare Car Rides ........................................................................................... E21 Compare 4-Digit Numbers ............................................................................... E22 Get Your Cards in Order .................................................................................. E23

Enrich Houghton Mifflin Harcourt Publishing Company

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Grade 2

BIG IDEA 2: Addition and SubtractionChapter 4: Basic Facts and Relationships4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 Tic+Tac+Toe ...................................................................................................... E24 Make-a-Ten Again ............................................................................................. E25 Fact Family ......................................................................................................... E26 What Is the Difference? .................................................................................... E27 Fix It .................................................................................................................... E28 Subtraction Rules ........................................................................................... E29 Repeat Bakery.................................................................................................... E30 Balance Things Out ........................................................................................... E31 A Balancing Act ................................................................................................. E32

Chapter 5: 2-Digit Addition5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 Add to the Score ................................................................................................ E33 Break Apart to Match ....................................................................................... E34 Tens and Ones Combinations .......................................................................... E35 Match the Sums .................................................................................................. E36 Addition in the Air ............................................................................................ E37 Estimation Time ................................................................................................. E38 Go Fish ................................................................................................................ E39 What is the Problem? ........................................................................................ E40 Adding Errors .................................................................................................... E41

5.10 Butterfly Addition.............................................................................................. E42 5.11 Trace the Path .................................................................................................... E43

Chapter 6: 2-Digit Subtraction6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 Which Difference is Different? ........................................................................ E44 A Maze of Thirties ............................................................................................. E45 Subtraction Bingo .............................................................................................. E46 The Art of Differences ...................................................................................... E47 Match It Up ........................................................................................................ E48 Choose the Numbers ......................................................................................... E49 Subtraction Riddles ........................................................................................... E50 Race to Zero ....................................................................................................... E51 How Many Could There Be? ........................................................................... E52

6.10 The Lost Digits ................................................................................................... E53 6.11 Add It Up Take It Away.............................................................................. E54


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Chapter 7: 3-Digit Addition7.1 7.2 7.3 7.4 7.5 7.6 7.7 Domino Break .................................................................................................... E55 The Read-a-Thon ............................................................................................... E56 The Nearest Hundred ........................................................................................ E57 3-Digit Scramble ................................................................................................ E58 3 on 3 Tournament ............................................................................................. E59 Paint By Regrouping ......................................................................................... E60 Addition Wheels ................................................................................................ E61

Chapter 8: 3-Digit Subtraction8.1 8.2 8.3 8.4 8.5 8.6 8.7 Find the Mistakes ............................................................................................... E62 Whats the Difference? ..................................................................................... E63 What Numbers Can You Use? ......................................................................... E64 Subtraction Steps ............................................................................................... E65 Check It Out ....................................................................................................... E66 Follow the Arrows to Subtract ......................................................................... E67 Mystery Number ................................................................................................ E68

BIG IDEA 3: Measurement and GeometryChapter 9: Length9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9 Compared to Me ................................................................................................ E69 Compare to Measure ......................................................................................... E70 The Long and Short of It .................................................................................. E71 Measure the Tools ............................................................................................. E72 Map Measurements ........................................................................................... E73 Handy Measuring ............................................................................................... E74 How Tall Are You? ........................................................................................... E75 Length Riddles ................................................................................................... E76 Centimeter Clips ................................................................................................ E77

9.10 Colorful Veggies ................................................................................................ E78 9.11 Measure by Hand ............................................................................................... E79 9.12 Centi-Meter Fever ............................................................................................. E80 9.13 Distance Drawings ............................................................................................. E81 9.14 Measurement Hike ............................................................................................ E82


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Grade 2

Chapter 10: Weight, Mass, Capacity, and Volume10.1 Ounces and Pounds ........................................................................................... E83 10.2 Measuring Mass.................................................................................................. E84 10.3 How Many Cups of Juice? ................................................................................ E85 10.4 Liter Beakers ...................................................................................................... E86 10.5 Volume of Irregular Figures ............................................................................. E87 10.6 Balancing Shapes ............................................................................................... E88

Chapter 11: Geometry and Patterns11.1 11.2 11.3 11.4 11.5 11.6 11.7 11.8 Geometric Shape Puzzle ................................................................................... E89 Build Shapes in Two Ways ............................................................................... E90 Build It ................................................................................................................ E91 Equal Parts.......................................................................................................... E92 Pattern Match ..................................................................................................... E93 Repeating Patterns ............................................................................................ E94 Field Day ............................................................................................................. E95 Circle Pattern...................................................................................................... E96

Chapter 12: Money and Time12.1 Find the Total Value.......................................................................................... E97 12.2 What Is the Missing Coin? ................................................................................ E98 12.3 Arrange and Count Coins ................................................................................. E99 12.4 Making Equal Amounts .................................................................................... E100 12.5 Same Amount, Different Ways ........................................................................ E101 12.6 Comparing at the Hardware Store................................................................... E102 12.7 Make a Dollar..................................................................................................... E103 12.8 Is There Enough Money? ................................................................................. E104 12.9 Act It Out with Bills .......................................................................................... E105 12.10 Matching the Time ............................................................................................. E106 12.11 Telling Time at the Zoo .................................................................................... E107 12.12 Make a Time Schedule ...................................................................................... E108


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Grade 2

Name

I Chapter 1, Lesson 1 EnrichFL Benchmark MA.2.A.1.1

Pencil Place ValueEach pencil box holds ten pencils. Draw a line from the pencils to the number that shows how many pencils are in each group.1.

47

2.

393.

284.

115.

52

Writing and Reasoning What digits dothe pencil boxes represent? What digits do the single pencils represent?


E1

Grade 2

Name


Expanding NumbersDescribe the number in another way. Write the number.

1.

68

6 8 tens ones=+

2.

=+

2 3 tens ones

3.

90 7 =+ tens ones

ten one4.

1 10 =+

Writing and Reasoning Create your ownexercise like the ones above for a friend to complete.


E2

Grade 2

Name


Race to Find the NumberDraw a race car next to each helmet. Label each race car with the correct two-digit number. Then write each number another way.1.

20 + 4

2.

eighty-five

3.

1 ten 9 ones

4.

thirty

Writing and Reasoning How did you choose theother way to write each number?


E3

Grade 2

Name


Marble Mix-Up

Read the clue. Think of a 2-digit number that matches the clue. Write the number as tens and ones. Then write the number.1.

tens ones2.

The number is:

tens ones3.

The number is:

tens ones4.

The number is:

tens ones

The number is:

Writing and Reasoning Why do both waysof writing the number of marbles represent the same number?


E4

Grade 2

Name


Odds and EndsStart at 0 and connect all the even numbers. Then start at 1 and connect all the odd numbers. 79 19 3 17 11

5

13

1 16

15 14

18 4 20 0 2 6 8

12

10

Writing and Reasoning What pattern do younotice about even and odd numbers?


E5

Grade 2

Name


More About Skip CountingRosa is skip counting by different numbers. She starts counting at 0. Read the clues. Circle the number she could be counting by.1. Rosa shades 68, 70, and 72 on

the hundred chart. She could be counting by: twos fours fives

1

2

3

4

5

6

7

8

9 10

11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100

2. Rosa shades 70 on the hundred

chart. She could be counting by: threes fours fives

3. Rosa shades 39 on the hundred chart.

She could be counting by: twos threes tens

4. Rosa shades 8 and 12 on the hundred chart.

She could be counting by: threes fours fives

Writing and Reasoning Could Rosa be countingby any other numbers for Exercise 2? What are they?


E6

Grade 2

Name


A Sticky SituationJamals stickers need to be organized. Each type of sticker must be grouped together. Different types of stickers cannot be on the same page. Each page can t 2 rows of 3 stickers. Draw a diagram to show the pages.

1. How many pages

do you need for2. How many pages

?


?


?

do you need for

?

Writing and Reasoning How many pages wouldyou need for each type of sticker if each page could fit 3 rows of 4 stickers?


E7

Grade 2

Name


Whats the Problem?Finish the table to show a pattern. Tell a story about the pattern.1.

1number of

5number of 2.

1number of

3number of 3.

3number of

18number of

Writing and Reasoning Write a problem togo with each table. Exchange with a partner. Solve. Show your work.


E8

Grade 2

Name


Make Your Own PredictionsUse a skip counting pattern. Skip count backward. Make a prediction. What number will be in the 10th position?

1st

2nd

3rd

4th

5th

6th

7th

8th

9th

10th

1. What number is in the 10th position? 2. What skip counting pattern did you use?

Use a different skip counting pattern. Skip count forward. Make a prediction. What number will be in the 20th position?

11th

12th

13th

14th

15th

16th

17th

18th

19th

20th

3. What number is in the 20th position? 4. What skip counting pattern did you use?

Writing and Reasoning How did you make agood prediction about a pattern?


E9

Grade 2

Name


Tic-Tac-HundredFind the value of each space on the board. Find three spaces in a row with the same value to get Tic-Tac-Hundred. Draw a line to connect them. ten sets of 10

20 tens

b12 sets of 10

bseventeen tens

b b17 tens 0 ones

b b

b19 tens

b

b

Writing and Reasoning Draw anotherboard. Write clues in each box that tell how many tens are in each number. Give your puzzle to a classmate to solve.


E10

Grade 2

Name


Find the NumberRead the clues. Find the number.1. A number is 4 hundreds more

2. A number is 2 hundreds more

than 142. What is the number?


3. A number is 3 tens more than

542


249. What is the number?


5. A number is 8 ones more than

6. A number is 4 hundreds more




8. A number is 6 ones more than



Writing and Reasoning How did you find theanswer to each question?


E11

Grade 2

Name


Value CluesUse the digits 8, 7, and 3 to make numbers. Use all three digits. Read the clues and write the numbers.1. 2.

The value of the digit 8 in this number is 80. The value of the digit 7 in this number is not 7.


The number is .3. 4.

The number is .



The number is .

The number is .

Writing and Reasoning Write a numberthat does not appear above. Use the same digits. Then write clues for your number.


E12

Grade 2

Name


Say It in LayersA step pyramid has different layers. Fill in each layer of the pyramid with two different ways of writing the number at the top.1. 2.

534

684

3.

4.

429

150

Writing and Reasoning Which pyramid has thegreatest value? Explain your reason.


E13

Grade 2

Name


Find the Greater Number1. Write a word problem about comparing 620 and 627

to find the greater number. Draw a model to show the solution.

2. Choose two 3-digit numbers. Write a word problem about comparing

the numbers. Find the greater number. Draw a model to show the solution.

Writing and Reasoning How did you find thegreater number?


E14

Grade 2

Name


ComparingWrite each digit once to build a number that will make the sentence true.1.

9, 6, 1

2.

2, 5, 8

< 1784.

< 852

3.

9, 3, 4

1, 8, 7 187 >

> 4396.

5.

2, 6 42 > 2 1

7, 3 33 > 36

7.

8, 5 3 7 < 67

8.

9, 5, 47

> 67

Writing and Reasoning Write a digit to make thesentence true.

84 > 873

Is there more than one digit you could use? Explain.


E15

Grade 2

Name


The Middle of the Train

Use the numbers at the top of the page. Write each number in a train car. Use each number once. Check that the numbers on each set of train cars is in order.

8431.

921

321

459

3662.

>

>

312

9783.

>

>

820

4324.

856

Writing and Reasoning Complete. Explain your answer.


E16

Grade 2

Name


Find the Number PatternUse a number pattern. Trace a path from least to greatest to lead the squirrel to the tree.

322 214 153 224 153 163 183 193 222 506 351 453 199 153 220 281 254 244 200

157

222 622

422 101 522 234 274 264 275 304

412

722 284 294

314

Writing and Reasoning What pattern did youuse to find the next number to move to on the path?


E17

Grade 2

Name


Brick by BrickWrite a number story about building a brick playhouse. Bricks come in stacks of 100. You will need more than 1,000 bricks but less than 9,000 bricks. Decide how many bricks you may need in all and draw to explain.

Writing and Reasoning Explain how ones,tens, hundreds, and thousands are related.


E18

Grade 2

Name


MatchingDraw a line to connect each model and shovel to the pail of the number it matches. Write the number on the pail.

2 thousands 4 hundreds 7 tens 5 ones 2 thousands 1 hundred 8 tens 9 ones 2 thousands 3 hundreds 7 tens 1 one 1 thousand 8 hundreds 2 tens 7 ones

Writing and Reasoning How did you knowwhich shovels and pails matched? Explain.


E19

Grade 2

Name


4-Digit CrosswordUse what you know about writing numbers in different ways to complete the crossword. Each answer will be a 4-digit number.

Down1. 1,000 + 200 + 30 + 4 4. seven thousand, nine hundred2 1

fifty-four6. 2,000 + 500 + 80 + 93 4

5

6 7

Across2. five thousand, two hundred seventy-six 3. 1 thousand 4 hundreds 8 tens 7 ones 5. 5,000 + 500 + 50 + 5 7. 4 thousands 6 hundreds 5 tens 7 ones 8. six thousand, nine hundred thirty-six

8

*

Writing and Reasoning Write your own clue andsolution for the last remaining column in the crossword puzzle.


E20

Grade 2

Name


Compare Car RidesUse the chart to compare road trips between capital cities. Compare the distance between Tallahassee and each city.

Distance from Floridas capital, TALLAHASSEE Anchorage, Alaska Austin, Texas Denver, Colorado Oklahoma City, Oklahoma Phoenix, Arizona Sacramento, California 4,616 miles 893 miles 1,632 miles 1,003 miles 1,882 miles 2,637 miles

1. Which trip is a greater distance from Tallahassee, Denver or

Sacramento? 2. Which trip is fewer miles from Tallahassee, Austin or Oklahoma

City? 3. Which trip is the greatest distance from Tallahassee?

Writing and Reasoning Choose two cities youwould like to visit from the list above. Write the distance for each trip and circle the trip that is the greater number of miles from Tallahassee.


E21

Grade 2

Name


Compare 4-Digit NumbersCircle any mistakes you see in the problems below. Write the correction above the mistake.

1.

3,250 = 3,520 9,876 < 9,456

2.

1,655 > 1,099 1,233 > 1,333

3.

4.

5.

7,000 > 6,898 7,331 = 1,431

6.

5,443 < 5,343 8,221 > 8,121

7.

8.

9.

2,657 < 2,757

10.

4,999 < 4,899

Writing and Reasoning What strategy did youuse to compare numbers? Explain.


E22

Grade 2

Name


Get Your Cards in OrderWrite the greatest 4-digit number you can make from each friends cards. Circle the greatest number in each group. Then, write the numbers in each group in order from least to greatest.

4 7 9 2KARI

3 5 7 9BRIAN

8 2 3 4CATHY