When you ask "What number is halfway between 81 and 91?" 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=91.
To find the number halfway between 81 and 91, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 91 into our formula, we get:
(81 + 91)/2 = 86
Thus, the number halfway between 81 and 91 is 86.
To check that our answer is correct, we subtract 81 from 86 and subtract 86 from 91 and compare the two numbers:
86 - 81 = 5
91 - 86 = 5
As you can see, the halfway number is 5 higher than 81 and 5 lower than 91. Therefore, our halfway between answer of 86 above is correct.
Halfway Between
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Halfway Between 81 and 92
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