Halfway Between 21 and 997

When you ask "What number is halfway between 21 and 997?" 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=997.

Halfway Between Line

To find the number halfway between 21 and 997, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 997 into our formula, we get:

(21 + 997)/2 = 509

Thus, the number halfway between 21 and 997 is 509.

To check that our answer is correct, we subtract 21 from 509 and subtract 509 from 997 and compare the two numbers:

509 - 21 = 488
997 - 509 = 488

As you can see, the halfway number is 488 higher than 21 and 488 lower than 997. Therefore, our halfway between answer of 509 above is correct.

Halfway Between
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Halfway Between 21 and 998
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