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Questions  >>  Olympiad-Math  >>  Class 5  >>  Measurements
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Q)

The value of 101.5 + 100.5 + 99.5 + 98.5 + 97.5 + 96.5 + 95.5 + 94.5 - 94 - 95 - 96 - 97 - 98 - 99 - 100 - 101 is?

(A) 3 (B) 4 (C) 5 (D) 8

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A)
One way to do it its to add the numbers from 101.5 to 94.5 and then subtract the numbers from 94 to 101. This can be time confusing and error prone.
Another way to do this is to pair up the numbers as follows: (101.5 - 101) + (100.5 - 100) + (99.5 - 99) + (98.5 - 98) + (97.5-97) + (96.5 - 96) + (95.5 - 95) + (94.5 - 94)
This becomes easier to compute as = 0.5 + 0.5 + 0.5 + 0.5 + 0.5 + 0.5 + 0.5 + 0.5 = 4.
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