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# Unsure of how the book gets its answers (Estimation)

1. Howdy .

I don't understand how the answers are the way they are.

I thought when estimating that 3.2^2 would be 3^2 as you go to one significant figure?

Is it different for these type of questions as I can't find anything that explains it?

Thanks
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2. (Original post by marcus888)
Howdy .

I don't understand how the answers are the way they are.

I thought when estimating that 3.2^2 would be 3^2 as you go to one significant figure?

Is it different for these type of questions as I can't find anything that explains it?

Thanks
You are estimating. In the first example, is going to be a little bit more than .

, so the answer is a little more than 9, so it's 10.

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