When you ask "What number is halfway between 87 and 128?" 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=128.
To find the number halfway between 87 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 128 into our formula, we get:
(87 + 128)/2 = 107.5
Thus, the number halfway between 87 and 128 is 107.5.
To check that our answer is correct, we subtract 87 from 107.5 and subtract 107.5 from 128 and compare the two numbers:
107.5 - 87 = 20.5
128 - 107.5 = 20.5
As you can see, the halfway number is 20.5 higher than 87 and 20.5 lower than 128. Therefore, our halfway between answer of 107.5 above is correct.
Halfway Between
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Halfway Between 87 and 129
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