When you ask "What number is halfway between 99 and 636?" 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=636.
To find the number halfway between 99 and 636, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 636 into our formula, we get:
(99 + 636)/2 = 367.5
Thus, the number halfway between 99 and 636 is 367.5.
To check that our answer is correct, we subtract 99 from 367.5 and subtract 367.5 from 636 and compare the two numbers:
367.5 - 99 = 268.5
636 - 367.5 = 268.5
As you can see, the halfway number is 268.5 higher than 99 and 268.5 lower than 636. Therefore, our halfway between answer of 367.5 above is correct.
Halfway Between
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Halfway Between 99 and 637
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