Friday, 7 February 2014

ARITHMETICS A6

Evaluate  20 + 10 – 8 – 7 – 9 + 7.

Solution

= 20 + 10 – 8 – 7 – 9 + 7

= 20 + 10 + 7 – 8 – 7 – 9

= 20 + 10 + 7 – (8 + 7 + 9)

= 37 – 24

= 13

TRY THIS.............


Evaluate  20 + 10 – 7 – 8 – 6 + 9

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