When you ask "What number is halfway between 87 and 118?" 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=118.
To find the number halfway between 87 and 118, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 118 into our formula, we get:
(87 + 118)/2 = 102.5
Thus, the number halfway between 87 and 118 is 102.5.
To check that our answer is correct, we subtract 87 from 102.5 and subtract 102.5 from 118 and compare the two numbers:
102.5 - 87 = 15.5
118 - 102.5 = 15.5
As you can see, the halfway number is 15.5 higher than 87 and 15.5 lower than 118. Therefore, our halfway between answer of 102.5 above is correct.
Halfway Between
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Halfway Between 87 and 119
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