Model Dividing by Decimals

Model Dividing by Decimals

Lesson 5.5

Kennedy is making going to sew some bags for her friends. She has 3.6 yards of fabric to use. She needs 0.3 yard for each bag. How many bags can she make from the 3.6 yards of fabric?

Are there any key words? What should we do to solve this problem?

Multiple Choice

Which division problem are we doing?

• 0.3 ÷ 3.6

• 3.6 ÷ 0.3

Let's model this!

• Using your models, shade 3.6 -> This is 3 wholes and 6 tenths.

• Divide them into groups of 0.3 (3 tenths in each group)

• How many groups did you make?

Turn and Talk

Why did you make groups that were equal to the divisor?

Poll

The divisor can tell...

• the number of same sized groups.

• the number in each group.

• both A and B.

Open Ended

Aimee has 2.7 yards of fabric and wants to make big bags that use 0.9 yards of fabric each. How would you model this problem?

Aimee has 2.7 yards of fabric and wants to make big bags that use 0.9 yards of fabric each.

• Put 2 wholes and 7 tenths together.

• Separate them into groups of 0.9.

• How many groups did you make?

Multiple Choice

Aimee has 2.7 yards of fabric and wants to make big bags that use 0.9 yards of fabric each.

• 0.3

• 3

Naim has $2.45 in nickels. How many stacks of $0.35 can he make?

What division problem are we doing? Model this with a drawing or base 10 models.

Multiple Choice

Naim has $2.45 in nickels. How many stacks of $0.35 can he make?

• 0.7

• 7

• 6

• 0.5

Let's try one more together!

:)

Luis has $3 and he wants to buy fishing hooks for $0.75 each. How many hooks can he buy?

• Separate 3 wholes into groups of 0.75.

• The number of groups represents the number of hooks he could buy.

Now, you try some!

÷

Nice job!

Open Ended

Now, write your own decimal division problem and solve it. Create a poster (or Slide) with a picture to go along with it. Type it here.