When you ask "What number is halfway between 90 and 135?" 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=135.
To find the number halfway between 90 and 135, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 135 into our formula, we get:
(90 + 135)/2 = 112.5
Thus, the number halfway between 90 and 135 is 112.5.
To check that our answer is correct, we subtract 90 from 112.5 and subtract 112.5 from 135 and compare the two numbers:
112.5 - 90 = 22.5
135 - 112.5 = 22.5
As you can see, the halfway number is 22.5 higher than 90 and 22.5 lower than 135. Therefore, our halfway between answer of 112.5 above is correct.
Halfway Between
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Halfway Between 90 and 136
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