When you ask "What number is halfway between 81 and 139?" 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=139.
To find the number halfway between 81 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 139 into our formula, we get:
(81 + 139)/2 = 110
Thus, the number halfway between 81 and 139 is 110.
To check that our answer is correct, we subtract 81 from 110 and subtract 110 from 139 and compare the two numbers:
110 - 81 = 29
139 - 110 = 29
As you can see, the halfway number is 29 higher than 81 and 29 lower than 139. Therefore, our halfway between answer of 110 above is correct.
Halfway Between
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Halfway Between 81 and 140
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