When you ask "What number is halfway between 81 and 122?" 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=122.
To find the number halfway between 81 and 122, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 122 into our formula, we get:
(81 + 122)/2 = 101.5
Thus, the number halfway between 81 and 122 is 101.5.
To check that our answer is correct, we subtract 81 from 101.5 and subtract 101.5 from 122 and compare the two numbers:
101.5 - 81 = 20.5
122 - 101.5 = 20.5
As you can see, the halfway number is 20.5 higher than 81 and 20.5 lower than 122. Therefore, our halfway between answer of 101.5 above is correct.
Halfway Between
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Halfway Between 81 and 123
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