When you ask "What number is halfway between 21 and 249?" 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=249.
To find the number halfway between 21 and 249, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 249 into our formula, we get:
(21 + 249)/2 = 135
Thus, the number halfway between 21 and 249 is 135.
To check that our answer is correct, we subtract 21 from 135 and subtract 135 from 249 and compare the two numbers:
135 - 21 = 114
249 - 135 = 114
As you can see, the halfway number is 114 higher than 21 and 114 lower than 249. Therefore, our halfway between answer of 135 above is correct.
Halfway Between
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Halfway Between 21 and 250
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