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To Estimate Sum Or Difference

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To Estimate Sum Or Difference:

1) Estimate: 5,290 + 17,986.

Solution:
You find 17,986 > 5,290.

Round off to thousands.
17,986 rounds off to - 18,000
+5,290 rounds off to - + 5,000
Estimated sum = 23,000

2) Estimate: 5,673 – 436.

Solution:
To begin with, we round off to thousands.
5,673 rounds off to - 6,000
– 436 rounds off to - (-) 0
Estimated difference = 6,000.

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