When you ask "What number is halfway between 81 and 86?" 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=86.
To find the number halfway between 81 and 86, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 86 into our formula, we get:
(81 + 86)/2 = 83.5
Thus, the number halfway between 81 and 86 is 83.5.
To check that our answer is correct, we subtract 81 from 83.5 and subtract 83.5 from 86 and compare the two numbers:
83.5 - 81 = 2.5
86 - 83.5 = 2.5
As you can see, the halfway number is 2.5 higher than 81 and 2.5 lower than 86. Therefore, our halfway between answer of 83.5 above is correct.
Halfway Between
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