When you ask "What number is halfway between 21 and 79?" 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=79.
To find the number halfway between 21 and 79, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 79 into our formula, we get:
(21 + 79)/2 = 50
Thus, the number halfway between 21 and 79 is 50.
To check that our answer is correct, we subtract 21 from 50 and subtract 50 from 79 and compare the two numbers:
50 - 21 = 29
79 - 50 = 29
As you can see, the halfway number is 29 higher than 21 and 29 lower than 79. Therefore, our halfway between answer of 50 above is correct.
Halfway Between
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Halfway Between 21 and 80
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