When you ask "What number is halfway between 21 and 550?" 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=550.
To find the number halfway between 21 and 550, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 550 into our formula, we get:
(21 + 550)/2 = 285.5
Thus, the number halfway between 21 and 550 is 285.5.
To check that our answer is correct, we subtract 21 from 285.5 and subtract 285.5 from 550 and compare the two numbers:
285.5 - 21 = 264.5
550 - 285.5 = 264.5
As you can see, the halfway number is 264.5 higher than 21 and 264.5 lower than 550. Therefore, our halfway between answer of 285.5 above is correct.
Halfway Between
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Halfway Between 21 and 551
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