When you ask "What number is halfway between 81 and 133?" 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=133.
To find the number halfway between 81 and 133, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 133 into our formula, we get:
(81 + 133)/2 = 107
Thus, the number halfway between 81 and 133 is 107.
To check that our answer is correct, we subtract 81 from 107 and subtract 107 from 133 and compare the two numbers:
107 - 81 = 26
133 - 107 = 26
As you can see, the halfway number is 26 higher than 81 and 26 lower than 133. Therefore, our halfway between answer of 107 above is correct.
Halfway Between
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Halfway Between 81 and 134
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