When you ask "What number is halfway between 81 and 840?" 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=840.
To find the number halfway between 81 and 840, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 840 into our formula, we get:
(81 + 840)/2 = 460.5
Thus, the number halfway between 81 and 840 is 460.5.
To check that our answer is correct, we subtract 81 from 460.5 and subtract 460.5 from 840 and compare the two numbers:
460.5 - 81 = 379.5
840 - 460.5 = 379.5
As you can see, the halfway number is 379.5 higher than 81 and 379.5 lower than 840. Therefore, our halfway between answer of 460.5 above is correct.
Halfway Between
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Halfway Between 81 and 841
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