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