When you ask "What number is halfway between 81 and 350?" 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=350.
To find the number halfway between 81 and 350, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 350 into our formula, we get:
(81 + 350)/2 = 215.5
Thus, the number halfway between 81 and 350 is 215.5.
To check that our answer is correct, we subtract 81 from 215.5 and subtract 215.5 from 350 and compare the two numbers:
215.5 - 81 = 134.5
350 - 215.5 = 134.5
As you can see, the halfway number is 134.5 higher than 81 and 134.5 lower than 350. Therefore, our halfway between answer of 215.5 above is correct.
Halfway Between
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Halfway Between 81 and 351
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