When you ask "What number is halfway between 81 and 124?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=81 and Y=124.
To find the number halfway between 81 and 124, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 124 into our formula, we get:
(81 + 124)/2 = 102.5
Thus, the number halfway between 81 and 124 is 102.5.
To check that our answer is correct, we subtract 81 from 102.5 and subtract 102.5 from 124 and compare the two numbers:
102.5 - 81 = 21.5
124 - 102.5 = 21.5
As you can see, the halfway number is 21.5 higher than 81 and 21.5 lower than 124. Therefore, our halfway between answer of 102.5 above is correct.
Halfway Between
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Halfway Between 81 and 125
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