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Estimating Sums and Differences

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Q 1: 29 + 45 estimate is about ________ . (hint: estimate the sum of two digit numbers by rounding to nearest tens place, that is 30+50 = ?).
50
70
80

 Q 2: 87 - 41 estimate is about ________ . (hint: estimate the difference of two digit numbers by rounding to nearest tens place, that is 90-40 = ?).
50
40
60

Q 3: 559 + 318 estimate is about ________ . (hint: estimate the sum of three digit numbers by rounding to nearest hundreds place, that is 600+300 = ?).
500
900
800

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