Module 2 Lesson 17

Use basic facts to estimate quotients with two-digit divisors.

• 5.NBT.1 Recognize that in a multi-digit number, a digit in one place represents 10 times as much as it represents in the place to its right and 1/10 of what it represents in the place to its left.5.NBT.6 Find whole-number quotients of whole numbers with up to four-digit dividends and two- digit divisors, using strategies based on place value, the properties of operations, and/or the relationship between multiplication and division. Illustrate and explain the calculation by using equations, rectangular arrays, and/or area models.

Common CoreStandards

Learning Targets

•I can use basic facts to estimate quotients with two-digit divisors.

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Count by fours.

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Count by four tens.

When I raise my hand stop counting.

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Count by fives.

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Count by five tens.

When I raise my hand stop counting.

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Count by sevens.

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Count by seven tens.

When I raise my hand stop counting.

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21 ≈ ___

Round to the nearest 10

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37 ≈ ___

Round to the nearest 10

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16 ≈ ___

Round to the nearest 10

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54 ≈ ___

Round to the nearest 10

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73 ≈ ___

Round to the nearest 10

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65 ≈ ___

Round to the nearest 10

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25 ≈ ___

Round to the nearest 10

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700 ÷ 10

Write the division sentence

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800 ÷ 20

Write as a 2 step division sentencetaking out the ten

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800 ÷ 20

Rewrite after solving the first part of the division problem

800 ÷ 10 ÷ 2

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800 ÷ 20

Write the answer

800 ÷ 10 ÷ 2

80 ÷ 2

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15,000 ÷ 30

Write the division sentence

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15,000 ÷ 30

Write as a 2 step division sentencetaking out the ten

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15,000 ÷ 30

Rewrite after solving the first part of the division problem

15,000 ÷ 10 ÷ 3

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15,000 ÷ 30

Write the answer

15,000 ÷ 10 ÷ 3

1500 ÷ 3

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15,000 ÷ 300

Write the division sentence

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15,000 ÷ 300

Write as a 2 step division sentencetaking out the ten

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15,000 ÷ 300

Rewrite after solving the first part of the division problem

15,000 ÷ 100 ÷ 3

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15,000 ÷ 300

Write the answer

15,000 ÷ 100 ÷ 3

150 ÷ 3

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450,000 ÷ 50

Write the division sentence

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450,000 ÷ 50

Write as a 2 step division sentencetaking out the ten

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450,000 ÷ 50

Rewrite after solving the first part of the division problem

450,000 ÷ 10 ÷ 5

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450,000 ÷ 50

Write the answer

450,000 ÷ 10 ÷ 5

45,000 ÷ 5

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21,000 ÷ 300

Write the division sentence

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21,000 ÷ 300

Write as a 2 step division sentencetaking out the ten

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21,000 ÷ 300

Rewrite after solving the first part of the division problem

21,000 ÷ 100 ÷ 3

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21,000 ÷ 300

Write the answer

21,000 ÷ 100 ÷ 3

210 ÷ 3

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852 pounds of grapes were packed equally into 3 boxes for shipping. How many pounds of grapes will

there be in 2 boxes?

Learn

Problem 1

402 ÷ 19

What’s the whole in this problem?

Learn

Problem 1

What’s the divisor?

402 ÷ 19

Learn

Problem 1

Round the divisor first

402 ÷ 19

Learn

Problem 1

What should we round 402 to?

402 ÷ 19

≈ _____ ÷ 20

Learn

Problem 2

149 ÷ 71

What do we do first to estimatethe quotient?

Learn

Problem 2

What should we round 149 to?

≈ _____ ÷ 70

149 ÷ 71

Learn

Problem 3

427 ÷ 58

What’s the estimated divisor?

Learn

Problem 3

What should we round 427 to?

≈ _____ ÷ 60

427 ÷ 58

Learn

Problem 4

293 ÷ 42

What’s the estimated divisor?

Learn

Problem 4

What should we round 293 to?

≈ _____ ÷ 40

293 ÷ 42

Learn

Problem 5

751 ÷ 93

What’s the estimated divisor?

Learn

Problem 5

What should we round 751 to?

≈ _____ ÷ 90

751 ÷ 93

Practice

Review