Why is it helpful to estimate the answer before adding or subtracting decimals?

1 answer:

4 0

So you can get a basic idea of what your actual answer will be in range of.

Example:
10.5+5.5=__

I can safely assume with estimating that it'll be 15.
Now when I actually find the correct answer which is 16, its a safe bet knowing that your estimate is close to your actual answer.

If you make an uneducated guess like saying 10.5+5.5 was 30 then your answer was 16 its makes you wonder how you got an estimate of almost 2x of 16.

Estimates help, so you know what range your real answer would be in.

Hope this helps

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Sergio039 [100]

Answer:

2 cubic feet

Step-by-step explanation:

Convert all the lengths to feet round them to tenths then multiply them.

The answer you have got should be also correct as you have multiplied all the lengths then converted to cubic feet. Since your instructor has said that this is wrong this seems to be the only option remaining.

1 feet = 12 inches

$12"=\frac{12}{12}=1'$

$14"=\frac{14}{12}=1.16=1.2'$

$20"=\frac{20}{12}=1.66=1.7'$

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