When you ask "What number is halfway between 81 and 358?" 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=358.
To find the number halfway between 81 and 358, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 358 into our formula, we get:
(81 + 358)/2 = 219.5
Thus, the number halfway between 81 and 358 is 219.5.
To check that our answer is correct, we subtract 81 from 219.5 and subtract 219.5 from 358 and compare the two numbers:
219.5 - 81 = 138.5
358 - 219.5 = 138.5
As you can see, the halfway number is 138.5 higher than 81 and 138.5 lower than 358. Therefore, our halfway between answer of 219.5 above is correct.
Halfway Between
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Halfway Between 81 and 359
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