Halfway Between 21 and 397

When you ask "What number is halfway between 21 and 397?" 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=397.

Halfway Between Line

To find the number halfway between 21 and 397, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 397 into our formula, we get:

(21 + 397)/2 = 209

Thus, the number halfway between 21 and 397 is 209.

To check that our answer is correct, we subtract 21 from 209 and subtract 209 from 397 and compare the two numbers:

209 - 21 = 188
397 - 209 = 188

As you can see, the halfway number is 188 higher than 21 and 188 lower than 397. Therefore, our halfway between answer of 209 above is correct.

Halfway Between
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Halfway Between 21 and 398
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