When you ask "What number is halfway between 20 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=20 and Y=251.
To find the number halfway between 20 and 251, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 251 into our formula, we get:
(20 + 251)/2 = 135.5
Thus, the number halfway between 20 and 251 is 135.5.
To check that our answer is correct, we subtract 20 from 135.5 and subtract 135.5 from 251 and compare the two numbers:
135.5 - 20 = 115.5
251 - 135.5 = 115.5
As you can see, the halfway number is 115.5 higher than 20 and 115.5 lower than 251. Therefore, our halfway between answer of 135.5 above is correct.
Halfway Between
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Halfway Between 20 and 252
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