When you ask "What number is halfway between 100 and 645?" 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=645.
To find the number halfway between 100 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 645 into our formula, we get:
(100 + 645)/2 = 372.5
Thus, the number halfway between 100 and 645 is 372.5.
To check that our answer is correct, we subtract 100 from 372.5 and subtract 372.5 from 645 and compare the two numbers:
372.5 - 100 = 272.5
645 - 372.5 = 272.5
As you can see, the halfway number is 272.5 higher than 100 and 272.5 lower than 645. Therefore, our halfway between answer of 372.5 above is correct.
Halfway Between
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Halfway Between 100 and 646
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