Module 1 Lesson 12

Presentation

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Mathematics

•

5th Grade

•

Medium

•

CCSS

5.NBT.B.7, 4.NBT.B.5, 6.NS.B.3

Standards-aligned

April Morgan

Used 13+ times

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4 Slides • 13 Questions

Module 1 Lesson 12

by April Morgan

I can multiply decimals by whole numbers and use estimation skills to determine the reasonableness of my answer.

Fill in the Blanks

Use an Area Model to solve 31 X 4

Fill in the Blanks

Use an Area Model to solve 3.1 X 4

Fill in the Blanks

Use an Area Model to solve .31 X 4

Look at the products of the last 3 problems:

124 12.4 1.24

What do you see?

Do these numbers have the same value?

Can you explain a multiplying strategy that would let me multiply first and then put the decimal in after?

Multiple Choice

5.1 x 6=

What would our new multiplication problem be if we

write 5.1 as tenths?

51 x 6

51 tenths X 6

5.1 x 6

0.51 x 6

Fill in the Blanks

51 X 6 =

Fill in the Blanks

What would my answer be once I put the decimal back in?

5.1 X 6 =

Multiple Choice

Choose the reasonable product for each expression. Explain your reasoning in the spaces below using

words, pictures, or numbers.

a. 2.5 × 4

0.1

100

Multiple Choice

Choose the reasonable product for each expression. Explain your reasoning in the spaces below using

words, pictures, or numbers.

b. 3.14 x 7

2198

219.8

21.98

2.198

Multiple Choice

Choose the reasonable product for each expression. Explain your reasoning in the spaces below using

words, pictures, or numbers.

c. 8 x 6.022

4.8176

48.176

481.76

4817.6

Multiple Choice

Choose the reasonable product for each expression. Explain your reasoning in the spaces below using

words, pictures, or numbers.

d. 9 x 5.48

493.2

49.32

4.932

0.4932

Open Ended

What trick can I use to help me understand where to place my decimals when I am multiplying by decimals?

Type response here

Fill in the Blanks

Pedro is building a spice rack with 4 shelves that are each 0.55 meter long. At the hardware store, Pedro

finds that he can only buy the shelving in whole meter lengths. Exactly how many meters of shelving

does Pedro need?

Fill in the Blanks

Pedro is building a spice rack with 4 shelves that are each 0.55 meter long. At the hardware store, Pedro

finds that he can only buy the shelving in whole meter lengths.

Since he can only buy whole-number lengths, how many meters of shelving should he

buy? Justify your thinking.

Module 1 Lesson 12

by April Morgan

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