
When you ask "What number is halfway between 87 and 127?" 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=127.

To find the number halfway between 87 and 127, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 127 into our formula, we get:
(87 + 127)/2 = 107
Thus, the number halfway between 87 and 127 is 107.
To check that our answer is correct, we subtract 87 from 107 and subtract 107 from 127 and compare the two numbers:
107 - 87 = 20
127 - 107 = 20
As you can see, the halfway number is 20 higher than 87 and 20 lower than 127. Therefore, our halfway between answer of 107 above is correct.
Halfway Between
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Halfway Between 87 and 128
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