When you ask "What number is halfway between 81 and 397?" 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=397.
To find the number halfway between 81 and 397, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 397 into our formula, we get:
(81 + 397)/2 = 239
Thus, the number halfway between 81 and 397 is 239.
To check that our answer is correct, we subtract 81 from 239 and subtract 239 from 397 and compare the two numbers:
239 - 81 = 158
397 - 239 = 158
As you can see, the halfway number is 158 higher than 81 and 158 lower than 397. Therefore, our halfway between answer of 239 above is correct.
Halfway Between
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Halfway Between 81 and 398
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