When you ask "What number is halfway between 21 and 631?" 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=631.
To find the number halfway between 21 and 631, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 631 into our formula, we get:
(21 + 631)/2 = 326
Thus, the number halfway between 21 and 631 is 326.
To check that our answer is correct, we subtract 21 from 326 and subtract 326 from 631 and compare the two numbers:
326 - 21 = 305
631 - 326 = 305
As you can see, the halfway number is 305 higher than 21 and 305 lower than 631. Therefore, our halfway between answer of 326 above is correct.
Halfway Between
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Halfway Between 21 and 632
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