When you ask "What number is halfway between 75 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=75 and Y=129.
To find the number halfway between 75 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 75 and 129 into our formula, we get:
(75 + 129)/2 = 102
Thus, the number halfway between 75 and 129 is 102.
To check that our answer is correct, we subtract 75 from 102 and subtract 102 from 129 and compare the two numbers:
102 - 75 = 27
129 - 102 = 27
As you can see, the halfway number is 27 higher than 75 and 27 lower than 129. Therefore, our halfway between answer of 102 above is correct.
Halfway Between
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Halfway Between 75 and 130
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