
When you ask "What number is halfway between 21 and 252?" 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=252.

To find the number halfway between 21 and 252, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 252 into our formula, we get:
(21 + 252)/2 = 136.5
Thus, the number halfway between 21 and 252 is 136.5.
To check that our answer is correct, we subtract 21 from 136.5 and subtract 136.5 from 252 and compare the two numbers:
136.5 - 21 = 115.5
252 - 136.5 = 115.5
As you can see, the halfway number is 115.5 higher than 21 and 115.5 lower than 252. Therefore, our halfway between answer of 136.5 above is correct.
Halfway Between
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Halfway Between 21 and 253
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