When you ask "What number is halfway between 20 and 21?" 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=21.
To find the number halfway between 20 and 21, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 21 into our formula, we get:
(20 + 21)/2 = 20.5
Thus, the number halfway between 20 and 21 is 20.5.
To check that our answer is correct, we subtract 20 from 20.5 and subtract 20.5 from 21 and compare the two numbers:
20.5 - 20 = 0.5
21 - 20.5 = 0.5
As you can see, the halfway number is 0.5 higher than 20 and 0.5 lower than 21. Therefore, our halfway between answer of 20.5 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 20 and 22
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