Lesson 22 - Estimate Quotients

 $357\div69$  

• 5

• 600

• 30

• 4

Answer explanation

The number 357 rounds to 400, and 69 rounds to 70. When you drop the zeros, the new division problem is 40 ÷ 7. In the multiples of 7, the two closest to 40 are 35 and 42. Your estimated answer should be 5 or 6.

Tags

CCSS.5.NBT.B.6

CCSS.6.NS.B.2

 $795\div89$  

• 9
  

• 80

• 10

• 90

Answer explanation

The number 795 rounds to 800, and 89 rounds to 90. When you drop the zeros, the new division problem is 80 ÷ 9. In the multiples of 9, 80 is closest to 81. Your estimated answer should be 9.

 $430\div57$  

• 80

• 10

• 90

• 7

Answer explanation

The number 430 rounds to 400, and 57 rounds to 60. When you drop the zeros, the new division problem is 40 ÷ 6. In the multiples of 6, 42 is closest to 40. Your estimated answer should be 7.

Tags

CCSS.4.NBT.B.6

Estimate the dividend and divisor and then divide to find an estimated quotient for the problem 678 ÷ 71

• 10

• 20

• 100

• 1

Answer explanation

The number 678 rounds to 700, and 71 rounds to 70. When you drop the zeros, the new division problem is 70 ÷ 7.

Tags

CCSS.5.NBT.B.7

A pet store sold 39 fish last week and made a total of $273. About how much did each fish cost?

Answer explanation

The number 273 rounds to 300, and 39 rounds to 40. When you drop the zeros, the new division problem is 30 ÷ 4. In the multiples of 4, 30 is closest to 28 and 32; 28 ÷ 4 = 7, and 32 ÷ 4 = 8

Round 48 to the nearest ten

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Round 67 to the nearest ten.

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Which number is the divisor in this problem

 $172\div19$  

Tags

CCSS.5.NBT.B.6

CCSS.6.NS.B.2