When you ask "What number is halfway between 81 and 902?" 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=902.
To find the number halfway between 81 and 902, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 902 into our formula, we get:
(81 + 902)/2 = 491.5
Thus, the number halfway between 81 and 902 is 491.5.
To check that our answer is correct, we subtract 81 from 491.5 and subtract 491.5 from 902 and compare the two numbers:
491.5 - 81 = 410.5
902 - 491.5 = 410.5
As you can see, the halfway number is 410.5 higher than 81 and 410.5 lower than 902. Therefore, our halfway between answer of 491.5 above is correct.
Halfway Between
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Halfway Between 81 and 903
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