maths smart grade 2 © 2012 alston publishing house pte ltd about

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdAbout

AboutM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

Jess is as tall as the metre ruler. She is about 1 metre tall.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdAdd mentally

Add mentallyM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

Add 58 and 8 mentally.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdAfter

AfterM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

Tuesday comes after Monday.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte Ltda.m.

a.m.M

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Any time from midnight to before noon.

Example:

7.25 in the morning can also be written as 7.25 a.m.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdBar graph

Bar graphM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

A bar graph uses bars instead of pictures or symbols to show data.

Example:

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdBefore

BeforeM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

Wednesday comes before Thursday.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdCalendar

CalendarM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

A table or chart that shows the days of the week and months of the year.

Example:

This calendar is for the month of January in the year 2012.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdCarroll diagram

Carroll diagramM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

A Carroll diagram helps us sort data in a ‘yes’ or ‘no’ manner. A simple Carroll diagram has two groups.

If the first group is labelled ‘A’, then the second group is usually labelled ‘Not A’.

Carroll diagramM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

The Carroll diagram sorts the children according to whether they wear glasses.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdCentimetre (cm)

Centimetre (cm)M

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

A unit of measurement for length.

Example:

The length from the 0 mark to the 1 mark on the ruler is 1 centimetre (or 1 cm).

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdCents (¢)

Cents (¢)M

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

A unit of measurement for money.

Example:

The quarter has a value of 25 cents. We can also write it as 25¢.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdChange

ChangeM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

Tom buys a top that costs 45¢.

He will get back 30¢ in change if he pays the cashier 75¢.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdDivide

DivideM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

We divide to share objects equally among groups or put objects into equal groups to find the number of groups. We use ÷ when we divide.

DivideM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

Share the storybooks equally between Tom and Ari.

Each boy gets 2 storybooks.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdDivision sentence

Division sentenceM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

‘4 ÷ 2 = 2’ is a division sentence. We read this as ‘4 divided by 2 equals 2’.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdDollars ($)

Dollars ($)M

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

A unit of measurement for money.

Example:

This note has a value of 10 dollars. We can also write it as $10.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdDouble

DoubleM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

When we find the double of a number, we add the number to itself.

Example:

Double of 20 = 20 + 20So, double of 20 = 40.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdEarlier

EarlierM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

2.10 p.m. is 30 minutes earlier than 2.40 p.m.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdGram (g)

Gram (g)M

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

A unit of measurement for mass.

Example:

The mass of the sweet is 5 grams (or 5 g).

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdHalf

HalfM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

When we find half of a number, we divide the number by 2.

Example:

24 ÷ 2 = 12So, half of 24 is 12.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdHalf litre ( l)2

1

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte Ltd

Half litre ( l)12

A unit of measurement for capacity.

Example:

The capacity of the vase is half litre (or l).21

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdHeavier

HeavierM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

The pineapple is heavier than the papaya.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdHeaviest

HeaviestM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

The watermelon is the heaviest.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdKilograms (kg)

Kilograms (kg)M

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

A unit of measurement for mass.

Example:

The mass of the bag of sugar is 1 kilogram (or 1 kg).

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdLater

LaterM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

10.20 a.m. is 1 hour later than 9.20 a.m.

1 hr later

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdLess than

Less thanM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

The stool is shorter than the metre ruler. It is less than 1 metre tall.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdLighter

LighterM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

The tennis ball is lighter than the basketball.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdLightest

LightestM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

The beach ball is the lightest.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdLitre (l)

Litre (l)M

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

A unit of measurement for capacity.

Example:

This is a 1 litre (or 1 l) measuring jug.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdLonger

LongerM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

Pencil B is longer than Pencil A.

Pencil C

Pencil B

Pencil A

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdLongest

LongestM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

Pencil C is the longest.

Pencil C

Pencil B

Pencil A

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdMetre (m)

Metre (m)M

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

A unit of measurement for length.

Example:

The ruler is 1 metre (or 1 m) long.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdMidnight

MidnightM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

The end of one day and the start of the next.

Example:

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdMore than

More thanM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

The teacher is taller than the metre ruler.She is more than 1 metre tall.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdMultiples

MultiplesM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

When any number is multiplied by 2, the answer is a multiple of 2.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte Ltd

Multiplication sentence

Multiplication sentenceM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

‘2 × 4 = 8’ is a multiplication sentence. We read this as ‘2 times 4 equals 8’.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdMultiply

MultiplyM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

When we add equal groups together, we are multiplying. We use × when we multiply.

MultiplyM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

We can multiply to find out how many apples there are.

2 groups of 4 = 8 2 × 4 = 8

There are 8 apples altogether.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdNoon

NoonM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Middle of the day.

Example:

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdNote

NoteM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

This is a one dollar ($1) note. It has two sides – front and back.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdNumber bond

Number bondM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

A number bond shows the parts that make up the whole.

Example:

2 and 5 make 7.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte Ltdp.m.

p.m.M

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Any time from noon to before midnight.

Example:

7.25 in the evening can also be written as 7.25 p.m.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte Ltd

Repeated addition

Repeated additionM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

We can use repeated addition to find out how many ducklings there are in 3 groups of 2.

3 groups of 2 = 2 + 2 + 2= 6

There are 6 ducklings in 3 groups of 2.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdScale

ScaleM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Measurements marked at regular intervals on a graph.

Example:

Scale

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdShorter

ShorterM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

Crayon C is shorter than Crayon A.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdShortest

ShortestM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

Crayon B is the shortest.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte Ltd

Subtract mentally

Subtract mentallyM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

Subtract 4 from 46 mentally.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdTaller

TallerM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

Giraffe B is taller than Giraffe A.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdTallest

TallestM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

Giraffe C is the tallest.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdTimetable

TimetableM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

Example:

This is a weekly timetable.

Maths SM

ART Grade 2 ©

2012 Alston Publishing House Pte LtdWeighing scale

Weighing scaleM

aths SMART G

rade 2 © 2012 Alston Publishing H

ouse Pte Ltd

A scale that measures the masses of objects.

Example:

We can read the mass of the notebook by looking at the markings on the weighing scale. The red pointer is at 100. So, the mass of the notebook is 100 g.