When you ask "What number is halfway between 21 and 278?" 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=278.
To find the number halfway between 21 and 278, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 278 into our formula, we get:
(21 + 278)/2 = 149.5
Thus, the number halfway between 21 and 278 is 149.5.
To check that our answer is correct, we subtract 21 from 149.5 and subtract 149.5 from 278 and compare the two numbers:
149.5 - 21 = 128.5
278 - 149.5 = 128.5
As you can see, the halfway number is 128.5 higher than 21 and 128.5 lower than 278. Therefore, our halfway between answer of 149.5 above is correct.
Halfway Between
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Halfway Between 21 and 279
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