When you ask "What number is halfway between 10 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=10 and Y=251.
To find the number halfway between 10 and 251, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 251 into our formula, we get:
(10 + 251)/2 = 130.5
Thus, the number halfway between 10 and 251 is 130.5.
To check that our answer is correct, we subtract 10 from 130.5 and subtract 130.5 from 251 and compare the two numbers:
130.5 - 10 = 120.5
251 - 130.5 = 120.5
As you can see, the halfway number is 120.5 higher than 10 and 120.5 lower than 251. Therefore, our halfway between answer of 130.5 above is correct.
Halfway Between
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Halfway Between 10 and 252
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