Module 2 Lesson 25

Module 2 Lesson 25

Use basic facts to approximate decimal quotients with two-digit divisors, reasoning about the placement of the decimal point.

• 5.NBT.7 Add, subtract, multiply, and divide decimals to

hundredths, using concrete models or drawings and

strategies based on place value, properties of operations,

and/or the relationship between addition and subtraction;

relate the strategy to a written method and explain the

reasoning used.

Common CoreStandards

Learning Targets

•I can use basic facts to approximate decimal quotients with two-digit divisors, reasoning about the placement of the decimal point.

Activate Knowledge

10 tenths

Write the number

Activate Knowledge

90 tenths

Write the number

Activate Knowledge

94 tenths

Write the number

Activate Knowledge

100 tenths

Write the number

Activate Knowledge

700 tenths

Write the number

Activate Knowledge

783 tenths

Write the number

Activate Knowledge

372 tenths

Write the number

Activate Knowledge

9 hundredths

Write the number

Activate Knowledge

10 hundredths

Write the number

Activate Knowledge

90 hundredths

Write the number

Activate Knowledge

98 hundredths

Write the number

Activate Knowledge

100 hundredths

Write the number

Activate Knowledge

900 hundredths

Write the number

Activate Knowledge

980 hundredths

Write the number

Activate Knowledge

1,000 hundredths

Write the number

Activate Knowledge

7,000 hundredths

Write the number

Activate Knowledge

7,400 hundredths

Write the number

Activate Knowledge

7,418 hundredths

Write the number

Activate Knowledge

4,835 hundredths

Write the number

Activate Knowledge

Write the division sentence and quotient

Thousand Hundred Ten One TenthHundredt

hThousand

th

380 ÷ 10

3 8 0

Activate Knowledge

When dividing by 10, digits shift howmany places to the right?

Thousand Hundred Ten One TenthHundredt

hThousand

th

380 ÷ 10

3 8 0

Activate Knowledge

Write the division sentence and quotient

Thousand Hundred Ten One TenthHundredt

hThousand

th

38 ÷ 10

3 8

Activate Knowledge

Write the division sentence and quotient

Thousand Hundred Ten One TenthHundredt

hThousand

th

3.8 ÷ 10

3 8

Activate Knowledge

Write the division sentence and quotient

Thousand Hundred Ten One TenthHundredt

hThousand

th

270 ÷ 10

2 7 0

Activate Knowledge

Write the division sentence and quotient

Thousand Hundred Ten One TenthHundredt

hThousand

th

2.7 ÷ 10

2 7

Activate Knowledge

Write the division sentence and quotient

Thousand Hundred Ten One TenthHundredt

hThousand

th

4,900 ÷ 10

4 9 0 0

Activate Knowledge

Write the division sentence and quotient

Thousand Hundred Ten One TenthHundredt

hThousand

th

49 ÷ 10

4 9

Activate Knowledge

Write the division sentence and quotient

Thousand Hundred Ten One TenthHundredt

hThousand

th

0.49 ÷ 10

4 9

Activate Knowledge

1.2 ÷ 4 =

Solve the division problem expressingthe whole in tenths

Activate Knowledge

1.2 ÷ 4 = 0.3

Write as a three step divisiontaking out the ten

1.2 ÷ 40 =

Activate Knowledge

1.2 ÷ 4 = 0.3

Write as a three step divisiontaking out the ten

1.2 ÷ 40 =

1.2 ÷ 40 = 1.2 ÷ 10 ÷ 4 = 0.12 ÷ 4 = 0.03

Activate Knowledge

2.4 ÷ 2 =

Solve the division problem expressingthe whole in tenths

Activate Knowledge

2.4 ÷ 2 =

Write as a three step divisiontaking out the ten

2.4 ÷ 20 =

Activate Knowledge

8 ÷ 2 =

Solve the division problem expressingthe whole in tenths

Activate Knowledge

8 ÷ 2 =

Write as a three step divisiontaking out the ten

8 ÷ 20 =

Activate Knowledge

0.35 ÷ 5 =

Solve the division problem expressingthe whole in hundredths

Activate Knowledge

0.35 ÷ 5 =

Write as a three step divisiontaking out the ten

0.35 ÷ 50 =

Activate Knowledge

Ms. Heinz spent 12 dollars on 30 bus tokens for the field trip. What was the cost of 12 tokens?

Learn

Problem 1

39.1 ÷ 17

Round the divisor first

Learn

Problem 1

39.1 ÷ 17

Round the the whole to somethingcan easily be divided by 20

____ ÷ 20 ≈

Learn

Problem 1

3.91 ÷ 17

Can you think of a multiple of 2

____ ÷ 20 ≈

Learn

Problem 1

3.91 ÷ 17

Can you think of a multiple of 2

____ ÷ 20 ≈

4 ÷ 20 = 4 ÷ 10 ÷ 2 = 0.4 ÷ 2 = 0.2.

4 ÷ 2 = 2 and 2 ÷ 10 = 0.2.

Learn

Problem 1

3.91 ÷ 17 ≈4 ÷ 20 =0.4 ÷ 2 =

0.2

39.1 ÷ 17 ≈40 ÷ 20 =

4 ÷ 2 =2

Learn

Problem 2

63.6 pounds of rice were put into73 bags. About how many pounds

of rice were in each bag?

Learn

Problem 2

63.6 ÷ 73

63.6 pounds of rice were put into73 bags. About how many pounds

of rice were in each bag?

Learn

Problem 2

63.6 ÷ 73 ≈____ ÷ 70

We can estimate the divisor to be 70because 63 in the whole is a

multiple of 7

Learn

Problem 2

6.36 ÷ 73 ≈

Learn

Problem 3

11.72 ÷ 42

Estimate the divisor

Learn

Problem 3

11.72 ÷ 42

What multiple of 4 is close to 11.72?

Practice

Review

Learn Review PracticeActivate

Knowledge

✔Check Understanding

Teamwork

Learning Targets