When you ask "What number is halfway between 87 and 270?" 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=270.
To find the number halfway between 87 and 270, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 270 into our formula, we get:
(87 + 270)/2 = 178.5
Thus, the number halfway between 87 and 270 is 178.5.
To check that our answer is correct, we subtract 87 from 178.5 and subtract 178.5 from 270 and compare the two numbers:
178.5 - 87 = 91.5
270 - 178.5 = 91.5
As you can see, the halfway number is 91.5 higher than 87 and 91.5 lower than 270. Therefore, our halfway between answer of 178.5 above is correct.
Halfway Between
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Halfway Between 87 and 271
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