Is it listed anywhere in the book whether it is front-end estimation or rounding to the 1st or 2nd significant digit?
>This is a sample problem out of a math workbook. I get that "estimating" essentially means performing calculations on rounded values, but they are mixing the places they round to in the example below. Why isn't it either 1 x 4 or 0.8 x 4.2? Not quite getting how they are doing that. I thought with rounding, you had to know the place you wanted to round to in order to have the product be valid.
>
>
>Estimate Decimal Products
>-------------------------
>
>Estimate 4.2 x 0.843
>
> 0.843 --------> 0.8
>x 4.2 --------> x 4
> ====
> about 3.2
>
>Both factors are rounded
>down. The actual product
>is greater than 3.2.
>
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