When you ask "What number is halfway between 42 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=42 and Y=251.
To find the number halfway between 42 and 251, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 251 into our formula, we get:
(42 + 251)/2 = 146.5
Thus, the number halfway between 42 and 251 is 146.5.
To check that our answer is correct, we subtract 42 from 146.5 and subtract 146.5 from 251 and compare the two numbers:
146.5 - 42 = 104.5
251 - 146.5 = 104.5
As you can see, the halfway number is 104.5 higher than 42 and 104.5 lower than 251. Therefore, our halfway between answer of 146.5 above is correct.
Halfway Between
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Halfway Between 42 and 252
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