When you ask "What number is halfway between 87 and 331?" 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=331.
To find the number halfway between 87 and 331, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 331 into our formula, we get:
(87 + 331)/2 = 209
Thus, the number halfway between 87 and 331 is 209.
To check that our answer is correct, we subtract 87 from 209 and subtract 209 from 331 and compare the two numbers:
209 - 87 = 122
331 - 209 = 122
As you can see, the halfway number is 122 higher than 87 and 122 lower than 331. Therefore, our halfway between answer of 209 above is correct.
Halfway Between
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Halfway Between 87 and 332
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