When you ask "What number is halfway between 20 and 99?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=99.
To find the number halfway between 20 and 99, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 99 into our formula, we get:
(20 + 99)/2 = 59.5
Thus, the number halfway between 20 and 99 is 59.5.
To check that our answer is correct, we subtract 20 from 59.5 and subtract 59.5 from 99 and compare the two numbers:
59.5 - 20 = 39.5
99 - 59.5 = 39.5
As you can see, the halfway number is 39.5 higher than 20 and 39.5 lower than 99. Therefore, our halfway between answer of 59.5 above is correct.
Halfway Between
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Halfway Between 20 and 100
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