When you ask "What number is halfway between 0 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=0 and Y=21.
To find the number halfway between 0 and 21, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 21 into our formula, we get:
(0 + 21)/2 = 10.5
Thus, the number halfway between 0 and 21 is 10.5.
To check that our answer is correct, we subtract 0 from 10.5 and subtract 10.5 from 21 and compare the two numbers:
10.5 - 0 = 10.5
21 - 10.5 = 10.5
As you can see, the halfway number is 10.5 higher than 0 and 10.5 lower than 21. Therefore, our halfway between answer of 10.5 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 0 and 22
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