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January 31, 2015

January 31, 2015

Posted by **B.B.** on Wednesday, June 10, 2009 at 12:11pm.

- Math -
**MathMate**, Wednesday, June 10, 2009 at 12:22pmThe answer is correct.

However, you may want to review your reasoning.

What you said*I rounded 978 to 1000 and 66 to 70. 1000*70=70,000 the actual answer was 978*66=64,448 so the estimation was greater than the actual answer.*

seems to tell me that you conclude that you were over-estimating**after**calculating the exact answer, which is not what is intended.

You are expected to determine if you answer is over- or under-estimating**without**calculating the exact answer.

Your teacher may prefer to see a reasoning as follows:

"I rounded 978 to 1000 and 66 to 70. 1000*70=70,000. Since I rounded**up**both multiplicands, the estimation was greater than the actual answer.

Check: 70000>978*66=64,448"

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