When you ask "What number is halfway between 51 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=51 and Y=251.
To find the number halfway between 51 and 251, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 251 into our formula, we get:
(51 + 251)/2 = 151
Thus, the number halfway between 51 and 251 is 151.
To check that our answer is correct, we subtract 51 from 151 and subtract 151 from 251 and compare the two numbers:
151 - 51 = 100
251 - 151 = 100
As you can see, the halfway number is 100 higher than 51 and 100 lower than 251. Therefore, our halfway between answer of 151 above is correct.
Halfway Between
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Halfway Between 51 and 252
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