When you ask "What number is halfway between 81 and 319?" 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=319.
To find the number halfway between 81 and 319, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 319 into our formula, we get:
(81 + 319)/2 = 200
Thus, the number halfway between 81 and 319 is 200.
To check that our answer is correct, we subtract 81 from 200 and subtract 200 from 319 and compare the two numbers:
200 - 81 = 119
319 - 200 = 119
As you can see, the halfway number is 119 higher than 81 and 119 lower than 319. Therefore, our halfway between answer of 200 above is correct.
Halfway Between
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Halfway Between 81 and 320
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