When you ask "What number is halfway between 99 and 638?" 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=638.
To find the number halfway between 99 and 638, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 638 into our formula, we get:
(99 + 638)/2 = 368.5
Thus, the number halfway between 99 and 638 is 368.5.
To check that our answer is correct, we subtract 99 from 368.5 and subtract 368.5 from 638 and compare the two numbers:
368.5 - 99 = 269.5
638 - 368.5 = 269.5
As you can see, the halfway number is 269.5 higher than 99 and 269.5 lower than 638. Therefore, our halfway between answer of 368.5 above is correct.
Halfway Between
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Halfway Between 99 and 639
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