When you ask "What number is halfway between 87 and 624?" 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=624.
To find the number halfway between 87 and 624, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 624 into our formula, we get:
(87 + 624)/2 = 355.5
Thus, the number halfway between 87 and 624 is 355.5.
To check that our answer is correct, we subtract 87 from 355.5 and subtract 355.5 from 624 and compare the two numbers:
355.5 - 87 = 268.5
624 - 355.5 = 268.5
As you can see, the halfway number is 268.5 higher than 87 and 268.5 lower than 624. Therefore, our halfway between answer of 355.5 above is correct.
Halfway Between
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Halfway Between 87 and 625
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