When you ask "What number is halfway between 81 and 102?" 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=102.
To find the number halfway between 81 and 102, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 102 into our formula, we get:
(81 + 102)/2 = 91.5
Thus, the number halfway between 81 and 102 is 91.5.
To check that our answer is correct, we subtract 81 from 91.5 and subtract 91.5 from 102 and compare the two numbers:
91.5 - 81 = 10.5
102 - 91.5 = 10.5
As you can see, the halfway number is 10.5 higher than 81 and 10.5 lower than 102. Therefore, our halfway between answer of 91.5 above is correct.
Halfway Between
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Halfway Between 81 and 103
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