When you ask "What number is halfway between 12 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=12 and Y=21.
To find the number halfway between 12 and 21, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 21 into our formula, we get:
(12 + 21)/2 = 16.5
Thus, the number halfway between 12 and 21 is 16.5.
To check that our answer is correct, we subtract 12 from 16.5 and subtract 16.5 from 21 and compare the two numbers:
16.5 - 12 = 4.5
21 - 16.5 = 4.5
As you can see, the halfway number is 4.5 higher than 12 and 4.5 lower than 21. Therefore, our halfway between answer of 16.5 above is correct.
Halfway Between
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Halfway Between 12 and 22
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