When you ask "What number is halfway between 21 and 277?" 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=277.
To find the number halfway between 21 and 277, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 277 into our formula, we get:
(21 + 277)/2 = 149
Thus, the number halfway between 21 and 277 is 149.
To check that our answer is correct, we subtract 21 from 149 and subtract 149 from 277 and compare the two numbers:
149 - 21 = 128
277 - 149 = 128
As you can see, the halfway number is 128 higher than 21 and 128 lower than 277. Therefore, our halfway between answer of 149 above is correct.
Halfway Between
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Halfway Between 21 and 278
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