When you ask "What number is halfway between 87 and 660?" 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=660.
To find the number halfway between 87 and 660, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 660 into our formula, we get:
(87 + 660)/2 = 373.5
Thus, the number halfway between 87 and 660 is 373.5.
To check that our answer is correct, we subtract 87 from 373.5 and subtract 373.5 from 660 and compare the two numbers:
373.5 - 87 = 286.5
660 - 373.5 = 286.5
As you can see, the halfway number is 286.5 higher than 87 and 286.5 lower than 660. Therefore, our halfway between answer of 373.5 above is correct.
Halfway Between
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