When you ask "What number is halfway between 81 and 142?" 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=142.
To find the number halfway between 81 and 142, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 142 into our formula, we get:
(81 + 142)/2 = 111.5
Thus, the number halfway between 81 and 142 is 111.5.
To check that our answer is correct, we subtract 81 from 111.5 and subtract 111.5 from 142 and compare the two numbers:
111.5 - 81 = 30.5
142 - 111.5 = 30.5
As you can see, the halfway number is 30.5 higher than 81 and 30.5 lower than 142. Therefore, our halfway between answer of 111.5 above is correct.
Halfway Between
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Halfway Between 81 and 143
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