When you ask "What number is halfway between 17 and 81?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=17 and Y=81.
To find the number halfway between 17 and 81, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 81 into our formula, we get:
(17 + 81)/2 = 49
Thus, the number halfway between 17 and 81 is 49.
To check that our answer is correct, we subtract 17 from 49 and subtract 49 from 81 and compare the two numbers:
49 - 17 = 32
81 - 49 = 32
As you can see, the halfway number is 32 higher than 17 and 32 lower than 81. Therefore, our halfway between answer of 49 above is correct.
Halfway Between
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Halfway Between 17 and 82
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