When you ask "What number is halfway between 87 and 670?" 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=670.
To find the number halfway between 87 and 670, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 670 into our formula, we get:
(87 + 670)/2 = 378.5
Thus, the number halfway between 87 and 670 is 378.5.
To check that our answer is correct, we subtract 87 from 378.5 and subtract 378.5 from 670 and compare the two numbers:
378.5 - 87 = 291.5
670 - 378.5 = 291.5
As you can see, the halfway number is 291.5 higher than 87 and 291.5 lower than 670. Therefore, our halfway between answer of 378.5 above is correct.
Halfway Between
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Halfway Between 87 and 671
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