When you ask "What number is halfway between 87 and 278?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=87 and Y=278.
To find the number halfway between 87 and 278, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 278 into our formula, we get:
(87 + 278)/2 = 182.5
Thus, the number halfway between 87 and 278 is 182.5.
To check that our answer is correct, we subtract 87 from 182.5 and subtract 182.5 from 278 and compare the two numbers:
182.5 - 87 = 95.5
278 - 182.5 = 95.5
As you can see, the halfway number is 95.5 higher than 87 and 95.5 lower than 278. Therefore, our halfway between answer of 182.5 above is correct.
Halfway Between
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Halfway Between 87 and 279
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