When you ask "What number is halfway between 21 and 280?" 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=280.
To find the number halfway between 21 and 280, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 280 into our formula, we get:
(21 + 280)/2 = 150.5
Thus, the number halfway between 21 and 280 is 150.5.
To check that our answer is correct, we subtract 21 from 150.5 and subtract 150.5 from 280 and compare the two numbers:
150.5 - 21 = 129.5
280 - 150.5 = 129.5
As you can see, the halfway number is 129.5 higher than 21 and 129.5 lower than 280. Therefore, our halfway between answer of 150.5 above is correct.
Halfway Between
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Halfway Between 21 and 281
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