When you ask "What number is halfway between 100 and 117?" 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=117.
To find the number halfway between 100 and 117, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 117 into our formula, we get:
(100 + 117)/2 = 108.5
Thus, the number halfway between 100 and 117 is 108.5.
To check that our answer is correct, we subtract 100 from 108.5 and subtract 108.5 from 117 and compare the two numbers:
108.5 - 100 = 8.5
117 - 108.5 = 8.5
As you can see, the halfway number is 8.5 higher than 100 and 8.5 lower than 117. Therefore, our halfway between answer of 108.5 above is correct.
Halfway Between
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Halfway Between 100 and 118
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