module 2 lesson 17
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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
Activate Knowledge
21,000 ÷ 300
Write as a 2 step division sentencetaking out the ten
Activate Knowledge
21,000 ÷ 300
Rewrite after solving the first part of the division problem
21,000 ÷ 100 ÷ 3
Activate Knowledge
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
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