When you ask "What number is halfway between 81 and 159?" 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=159.
To find the number halfway between 81 and 159, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 159 into our formula, we get:
(81 + 159)/2 = 120
Thus, the number halfway between 81 and 159 is 120.
To check that our answer is correct, we subtract 81 from 120 and subtract 120 from 159 and compare the two numbers:
120 - 81 = 39
159 - 120 = 39
As you can see, the halfway number is 39 higher than 81 and 39 lower than 159. Therefore, our halfway between answer of 120 above is correct.
Halfway Between
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Halfway Between 81 and 160
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