When you ask "What number is halfway between 87 and 758?" 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=758.
To find the number halfway between 87 and 758, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 758 into our formula, we get:
(87 + 758)/2 = 422.5
Thus, the number halfway between 87 and 758 is 422.5.
To check that our answer is correct, we subtract 87 from 422.5 and subtract 422.5 from 758 and compare the two numbers:
422.5 - 87 = 335.5
758 - 422.5 = 335.5
As you can see, the halfway number is 335.5 higher than 87 and 335.5 lower than 758. Therefore, our halfway between answer of 422.5 above is correct.
Halfway Between
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Halfway Between 87 and 759
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