When you ask "What number is halfway between 81 and 790?" 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=790.
To find the number halfway between 81 and 790, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 790 into our formula, we get:
(81 + 790)/2 = 435.5
Thus, the number halfway between 81 and 790 is 435.5.
To check that our answer is correct, we subtract 81 from 435.5 and subtract 435.5 from 790 and compare the two numbers:
435.5 - 81 = 354.5
790 - 435.5 = 354.5
As you can see, the halfway number is 354.5 higher than 81 and 354.5 lower than 790. Therefore, our halfway between answer of 435.5 above is correct.
Halfway Between
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Halfway Between 81 and 791
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