When you ask "What number is halfway between 85 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=85 and Y=135.
To find the number halfway between 85 and 135, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 135 into our formula, we get:
(85 + 135)/2 = 110
Thus, the number halfway between 85 and 135 is 110.
To check that our answer is correct, we subtract 85 from 110 and subtract 110 from 135 and compare the two numbers:
110 - 85 = 25
135 - 110 = 25
As you can see, the halfway number is 25 higher than 85 and 25 lower than 135. Therefore, our halfway between answer of 110 above is correct.
Halfway Between
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Halfway Between 85 and 136
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