When you ask "What number is halfway between 21 and 478?" 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=478.
To find the number halfway between 21 and 478, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 478 into our formula, we get:
(21 + 478)/2 = 249.5
Thus, the number halfway between 21 and 478 is 249.5.
To check that our answer is correct, we subtract 21 from 249.5 and subtract 249.5 from 478 and compare the two numbers:
249.5 - 21 = 228.5
478 - 249.5 = 228.5
As you can see, the halfway number is 228.5 higher than 21 and 228.5 lower than 478. Therefore, our halfway between answer of 249.5 above is correct.
Halfway Between
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Halfway Between 21 and 479
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