When you ask "What number is halfway between 80 and 100?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=80 and Y=100.
To find the number halfway between 80 and 100, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 80 and 100 into our formula, we get:
(80 + 100)/2 = 90
Thus, the number halfway between 80 and 100 is 90.
To check that our answer is correct, we subtract 80 from 90 and subtract 90 from 100 and compare the two numbers:
90 - 80 = 10
100 - 90 = 10
As you can see, the halfway number is 10 higher than 80 and 10 lower than 100. Therefore, our halfway between answer of 90 above is correct.
Halfway Between
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Halfway Between 80 and 101
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