October 21st, 2013

Go MathLesson 2.2

Common Core Learning Standard

Use the four operations with whole numbers to solve problems. CC.4.OA.2 Multiply or divide to solve word problems involving multiplicative comparisons, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem, distinguishing multiplicative comparison from additive comparisons.

I Can…

Distinguish multiplicative comparison from additive

comparisons by using drawings and equations with a symbol for

the unknown number to represent the problem

Essential Question

How does a model help you solve a comparison model?

Let’s Review

1,243

Bar Model: Comparison1,278

Ms. Flores had 430 pennies. Daniel has 265 pennies. How many more pennies

does Ms. Flores have then Daniel?

Ms. Flores

Daniel

Multiplicative ComparisonIn multiplicative comparison, one quantity is a certain number of times as much or times as

many as another quantity.Example:

Mr. Steve and Ms. Cano were given 100 pencils to hand out to their 4th grade classes. Ms. Cano has 3 times as many

pencils as Mr. Steve. How many pencils does Mr. Steve have?

n

n n n1 times more

2 times more

3 times more

100Pencils

Steve

CanoThere are 4 parts. The parts together equal 100.

4 x n = 100Solve for n

Bonus: How many pencils does Ms. Cano’s class have?

Give it a Try!

There are 30 dogs. There are 4 times as many boxers as spaniels. How

many spaniels are there?

Go MathWork on page 49. When you are

done, turn and talk with your partner to discuss your

answers.

When you are done, work independently on pages 50-52

Checking for Understanding. Did I Get

it?

Work on page 49 with a partner.

Then, work independently on pages 50-52.

Raise your hand when you are done.

GO MATH. On Your Own Pg. 53-54

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RTI Tier 1Following Students

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Summary

Write a problem involving how much more than and solve it.

Explain how drawing a diagram helped you solve the problem.