When you ask "What number is halfway between 4 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=4 and Y=251.
To find the number halfway between 4 and 251, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 251 into our formula, we get:
(4 + 251)/2 = 127.5
Thus, the number halfway between 4 and 251 is 127.5.
To check that our answer is correct, we subtract 4 from 127.5 and subtract 127.5 from 251 and compare the two numbers:
127.5 - 4 = 123.5
251 - 127.5 = 123.5
As you can see, the halfway number is 123.5 higher than 4 and 123.5 lower than 251. Therefore, our halfway between answer of 127.5 above is correct.
Halfway Between
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Halfway Between 4 and 252
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