When you ask "What number is halfway between 5 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=5 and Y=251.
To find the number halfway between 5 and 251, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 5 and 251 into our formula, we get:
(5 + 251)/2 = 128
Thus, the number halfway between 5 and 251 is 128.
To check that our answer is correct, we subtract 5 from 128 and subtract 128 from 251 and compare the two numbers:
128 - 5 = 123
251 - 128 = 123
As you can see, the halfway number is 123 higher than 5 and 123 lower than 251. Therefore, our halfway between answer of 128 above is correct.
Halfway Between
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Halfway Between 5 and 252
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