Halfway Between 20 and 640

When you ask "What number is halfway between 20 and 640?" 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=640.

Halfway Between Line

To find the number halfway between 20 and 640, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 20 and 640 into our formula, we get:

(20 + 640)/2 = 330

Thus, the number halfway between 20 and 640 is 330.

To check that our answer is correct, we subtract 20 from 330 and subtract 330 from 640 and compare the two numbers:

330 - 20 = 310
640 - 330 = 310

As you can see, the halfway number is 310 higher than 20 and 310 lower than 640. Therefore, our halfway between answer of 330 above is correct.

Halfway Between
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