Module 1 Lesson 12

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

Fill in the Blanks

Fill in the Blanks

​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

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

• 1

• 10

• 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?