When you ask "What number is halfway between 99 and 682?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=99 and Y=682.
To find the number halfway between 99 and 682, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 682 into our formula, we get:
(99 + 682)/2 = 390.5
Thus, the number halfway between 99 and 682 is 390.5.
To check that our answer is correct, we subtract 99 from 390.5 and subtract 390.5 from 682 and compare the two numbers:
390.5 - 99 = 291.5
682 - 390.5 = 291.5
As you can see, the halfway number is 291.5 higher than 99 and 291.5 lower than 682. Therefore, our halfway between answer of 390.5 above is correct.
Halfway Between
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Halfway Between 99 and 683
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