When you ask "What number is halfway between 87 and 678?" 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=678.
To find the number halfway between 87 and 678, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 678 into our formula, we get:
(87 + 678)/2 = 382.5
Thus, the number halfway between 87 and 678 is 382.5.
To check that our answer is correct, we subtract 87 from 382.5 and subtract 382.5 from 678 and compare the two numbers:
382.5 - 87 = 295.5
678 - 382.5 = 295.5
As you can see, the halfway number is 295.5 higher than 87 and 295.5 lower than 678. Therefore, our halfway between answer of 382.5 above is correct.
Halfway Between
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Halfway Between 87 and 679
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