When you ask "What number is halfway between 85 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=85 and Y=129.
To find the number halfway between 85 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 129 into our formula, we get:
(85 + 129)/2 = 107
Thus, the number halfway between 85 and 129 is 107.
To check that our answer is correct, we subtract 85 from 107 and subtract 107 from 129 and compare the two numbers:
107 - 85 = 22
129 - 107 = 22
As you can see, the halfway number is 22 higher than 85 and 22 lower than 129. Therefore, our halfway between answer of 107 above is correct.
Halfway Between
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Halfway Between 85 and 130
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