When you ask "What number is halfway between 99 and 637?" 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=637.
To find the number halfway between 99 and 637, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 637 into our formula, we get:
(99 + 637)/2 = 368
Thus, the number halfway between 99 and 637 is 368.
To check that our answer is correct, we subtract 99 from 368 and subtract 368 from 637 and compare the two numbers:
368 - 99 = 269
637 - 368 = 269
As you can see, the halfway number is 269 higher than 99 and 269 lower than 637. Therefore, our halfway between answer of 368 above is correct.
Halfway Between
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Halfway Between 99 and 638
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