When you ask "What number is halfway between 88 and 129?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=88 and Y=129.
To find the number halfway between 88 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 88 and 129 into our formula, we get:
(88 + 129)/2 = 108.5
Thus, the number halfway between 88 and 129 is 108.5.
To check that our answer is correct, we subtract 88 from 108.5 and subtract 108.5 from 129 and compare the two numbers:
108.5 - 88 = 20.5
129 - 108.5 = 20.5
As you can see, the halfway number is 20.5 higher than 88 and 20.5 lower than 129. Therefore, our halfway between answer of 108.5 above is correct.
Halfway Between
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Halfway Between 88 and 130
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