When you ask "What number is halfway between 21 and 628?" 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=628.
To find the number halfway between 21 and 628, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 628 into our formula, we get:
(21 + 628)/2 = 324.5
Thus, the number halfway between 21 and 628 is 324.5.
To check that our answer is correct, we subtract 21 from 324.5 and subtract 324.5 from 628 and compare the two numbers:
324.5 - 21 = 303.5
628 - 324.5 = 303.5
As you can see, the halfway number is 303.5 higher than 21 and 303.5 lower than 628. Therefore, our halfway between answer of 324.5 above is correct.
Halfway Between
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Halfway Between 21 and 629
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