Halfway Between 20 and 664

When you ask "What number is halfway between 20 and 664?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=664.

Halfway Between Line

To find the number halfway between 20 and 664, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 20 and 664 into our formula, we get:

(20 + 664)/2 = 342

Thus, the number halfway between 20 and 664 is 342.

To check that our answer is correct, we subtract 20 from 342 and subtract 342 from 664 and compare the two numbers:

342 - 20 = 322
664 - 342 = 322

As you can see, the halfway number is 322 higher than 20 and 322 lower than 664. Therefore, our halfway between answer of 342 above is correct.

Halfway Between
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Halfway Between 20 and 665
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