Homework Help: Math

Posted by Isaac on Wednesday, April 20, 2011 at 4:07am.

Explain how you could estimate 22% of 78 to check if your answer is reasonable.

Math - Anonymous, Wednesday, April 20, 2011 at 4:33am
22%=22/100

22% of 78= 22*78/100 = 1716/100 = 17.16
Math - DrRuss, Wednesday, April 20, 2011 at 8:20am
An exact answer is definitely not required.

20% is approximately a fifth (1/5)

78 is nearly 80

a fifth of 80 is 16

so the answer should be near 16

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