When you ask "What number is halfway between 81 and 860?" 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=860.
To find the number halfway between 81 and 860, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 860 into our formula, we get:
(81 + 860)/2 = 470.5
Thus, the number halfway between 81 and 860 is 470.5.
To check that our answer is correct, we subtract 81 from 470.5 and subtract 470.5 from 860 and compare the two numbers:
470.5 - 81 = 389.5
860 - 470.5 = 389.5
As you can see, the halfway number is 389.5 higher than 81 and 389.5 lower than 860. Therefore, our halfway between answer of 470.5 above is correct.
Halfway Between
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Halfway Between 81 and 861
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