When you ask "What number is halfway between 99 and 136?" 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=136.
To find the number halfway between 99 and 136, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 136 into our formula, we get:
(99 + 136)/2 = 117.5
Thus, the number halfway between 99 and 136 is 117.5.
To check that our answer is correct, we subtract 99 from 117.5 and subtract 117.5 from 136 and compare the two numbers:
117.5 - 99 = 18.5
136 - 117.5 = 18.5
As you can see, the halfway number is 18.5 higher than 99 and 18.5 lower than 136. Therefore, our halfway between answer of 117.5 above is correct.
Halfway Between
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Halfway Between 99 and 137
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