When you ask "What number is halfway between 87 and 840?" 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=840.
To find the number halfway between 87 and 840, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 840 into our formula, we get:
(87 + 840)/2 = 463.5
Thus, the number halfway between 87 and 840 is 463.5.
To check that our answer is correct, we subtract 87 from 463.5 and subtract 463.5 from 840 and compare the two numbers:
463.5 - 87 = 376.5
840 - 463.5 = 376.5
As you can see, the halfway number is 376.5 higher than 87 and 376.5 lower than 840. Therefore, our halfway between answer of 463.5 above is correct.
Halfway Between
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Halfway Between 87 and 841
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