When you ask "What number is halfway between 81 and 340?" 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=340.
To find the number halfway between 81 and 340, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 340 into our formula, we get:
(81 + 340)/2 = 210.5
Thus, the number halfway between 81 and 340 is 210.5.
To check that our answer is correct, we subtract 81 from 210.5 and subtract 210.5 from 340 and compare the two numbers:
210.5 - 81 = 129.5
340 - 210.5 = 129.5
As you can see, the halfway number is 129.5 higher than 81 and 129.5 lower than 340. Therefore, our halfway between answer of 210.5 above is correct.
Halfway Between
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Halfway Between 81 and 341
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