When you ask "What number is halfway between 21 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=21 and Y=129.
To find the number halfway between 21 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 129 into our formula, we get:
(21 + 129)/2 = 75
Thus, the number halfway between 21 and 129 is 75.
To check that our answer is correct, we subtract 21 from 75 and subtract 75 from 129 and compare the two numbers:
75 - 21 = 54
129 - 75 = 54
As you can see, the halfway number is 54 higher than 21 and 54 lower than 129. Therefore, our halfway between answer of 75 above is correct.
Halfway Between
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Halfway Between 21 and 130
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