When you ask "What number is halfway between 21 and 42?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=42.
To find the number halfway between 21 and 42, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 42 into our formula, we get:
(21 + 42)/2 = 31.5
Thus, the number halfway between 21 and 42 is 31.5.
To check that our answer is correct, we subtract 21 from 31.5 and subtract 31.5 from 42 and compare the two numbers:
31.5 - 21 = 10.5
42 - 31.5 = 10.5
As you can see, the halfway number is 10.5 higher than 21 and 10.5 lower than 42. Therefore, our halfway between answer of 31.5 above is correct.
Halfway Between
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Halfway Between 21 and 43
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