When you ask "What number is halfway between 100 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=100 and Y=637.
To find the number halfway between 100 and 637, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 637 into our formula, we get:
(100 + 637)/2 = 368.5
Thus, the number halfway between 100 and 637 is 368.5.
To check that our answer is correct, we subtract 100 from 368.5 and subtract 368.5 from 637 and compare the two numbers:
368.5 - 100 = 268.5
637 - 368.5 = 268.5
As you can see, the halfway number is 268.5 higher than 100 and 268.5 lower than 637. Therefore, our halfway between answer of 368.5 above is correct.
Halfway Between
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Halfway Between 100 and 638
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