When you ask "What number is halfway between 99 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=99 and Y=645.
To find the number halfway between 99 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 645 into our formula, we get:
(99 + 645)/2 = 372
Thus, the number halfway between 99 and 645 is 372.
To check that our answer is correct, we subtract 99 from 372 and subtract 372 from 645 and compare the two numbers:
372 - 99 = 273
645 - 372 = 273
As you can see, the halfway number is 273 higher than 99 and 273 lower than 645. Therefore, our halfway between answer of 372 above is correct.
Halfway Between
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Halfway Between 99 and 646
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