When you ask "What number is halfway between 90 and 115?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=90 and Y=115.
To find the number halfway between 90 and 115, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 115 into our formula, we get:
(90 + 115)/2 = 102.5
Thus, the number halfway between 90 and 115 is 102.5.
To check that our answer is correct, we subtract 90 from 102.5 and subtract 102.5 from 115 and compare the two numbers:
102.5 - 90 = 12.5
115 - 102.5 = 12.5
As you can see, the halfway number is 12.5 higher than 90 and 12.5 lower than 115. Therefore, our halfway between answer of 102.5 above is correct.
Halfway Between
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Halfway Between 90 and 116
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