When you ask "What number is halfway between 81 and 862?" 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=862.
To find the number halfway between 81 and 862, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 862 into our formula, we get:
(81 + 862)/2 = 471.5
Thus, the number halfway between 81 and 862 is 471.5.
To check that our answer is correct, we subtract 81 from 471.5 and subtract 471.5 from 862 and compare the two numbers:
471.5 - 81 = 390.5
862 - 471.5 = 390.5
As you can see, the halfway number is 390.5 higher than 81 and 390.5 lower than 862. Therefore, our halfway between answer of 471.5 above is correct.
Halfway Between
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