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Estimating Sums

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Estimating Sums

5 7

+ 3 1

5 7 5 7

+ 3 1+ 3 1

8 8

5 7 6 0

+ 3 1 +3 0

9 0

6 8

+ 2 4

6 8

+ 2 4+_____

9 2

6 8 7 0

+ 2 4+ 2 0_

9 2 9 0

367

+ 456

367

+ 456+_____

823

367 400

+ 456+_500

823900

897

+ 412

897

+ 412+_____

1309

897 900

+ 412+_ 400

1309 1300

635

+ 342

635

+ 342+_____

977

635 600

+ 342+_300

977900

3,269

+ 1,629

3,269

+1,629 + _______

4,898

3,269 3,000

+1,629+2,000

4,898 5,000

4,092

+ 2,808

4,092

+2,808+_____

6,900

4,092 4,000

+2,808+ 3,000

6,900 7,000