Estimate the following sum to its nearest ten:
67+40

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Solution

$e s t i m a t e d v a l u e o f 67 t o n e a r e s t t e n = 70 e s t i m a t e d v a l u e o f 40 t o n e a r e s t t e n = 40 N o w, s u m = 70 + 40 = 110 H e n c e, t h e e s t i m a t e d s u m t o i t s n e a r e s t t e n i s 110$

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