Estimate Sums and Differences to the Nearest Whole Number
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Problem Solving
100

Estimate the sum of:

741.26 + 103.75 = 

845

100

97.65 + 23.08 =

120.73

100

37.82 - 5.07 =

32.75

100

6.3 + 2.98 + 5.7 =

14.98

100

Newton buys a board game for $9.98 and a pack of gum for $1.32. He gives the cashier $15. How much change does he receive?

$3.70

200

Estimate the difference of:

64.9 - 17.52 = 

47

200

461.2 + 78.5 =

539.7

200

582.58 - 33.21 =

549.37

200

(8 x 4) - 9.07 =

22.93

200

Moana went to Starbucks. She bought a cake pop for $3.89 and a drink for $6.72. How much money did she spend at Starbucks?

$10.61

300

Oscar estimates a difference by rounding each number to the nearest whole number. His estimate is 6. Which two problems could he have estimated?

A. 97.5 - 91.8

B. 10.3 - 4.6

C. 23.7 - 18.16

A & C

300

8.097 + 23 =

31.097

300

(9.28 - 5.4) - 2.75 =

1.13

300

559.8 + 40.2 - 29.6 =

570.4

300

Bob has $436.07 in his bank account. He deposits (+) $14.00 and withdraws (-) $27.50. How much money is in Bob’s bank account?

$422.57

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