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Q.

Estimate and solve to the nearest tens: 88 – 29.

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a

90 

b

60 

c

 70 

d

50 

answer is B.

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Detailed Solution

Round off 88 to the nearest tens is 90. 

Round off 29 to the nearest tens is 30. 

Thus, the estimated difference of 90 – 30 = 60.

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