When you ask "What number is halfway between 87 and 542?" 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=542.
To find the number halfway between 87 and 542, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 542 into our formula, we get:
(87 + 542)/2 = 314.5
Thus, the number halfway between 87 and 542 is 314.5.
To check that our answer is correct, we subtract 87 from 314.5 and subtract 314.5 from 542 and compare the two numbers:
314.5 - 87 = 227.5
542 - 314.5 = 227.5
As you can see, the halfway number is 227.5 higher than 87 and 227.5 lower than 542. Therefore, our halfway between answer of 314.5 above is correct.
Halfway Between
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Halfway Between 87 and 543
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