When you ask "What number is halfway between 21 and 251?" 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=251.
To find the number halfway between 21 and 251, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 251 into our formula, we get:
(21 + 251)/2 = 136
Thus, the number halfway between 21 and 251 is 136.
To check that our answer is correct, we subtract 21 from 136 and subtract 136 from 251 and compare the two numbers:
136 - 21 = 115
251 - 136 = 115
As you can see, the halfway number is 115 higher than 21 and 115 lower than 251. Therefore, our halfway between answer of 136 above is correct.
Halfway Between
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Halfway Between 21 and 252
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