Halfway Between 100 and 640

When you ask "What number is halfway between 100 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=100 and Y=640.

Halfway Between Line

To find the number halfway between 100 and 640, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 100 and 640 into our formula, we get:

(100 + 640)/2 = 370

Thus, the number halfway between 100 and 640 is 370.

To check that our answer is correct, we subtract 100 from 370 and subtract 370 from 640 and compare the two numbers:

370 - 100 = 270
640 - 370 = 270

As you can see, the halfway number is 270 higher than 100 and 270 lower than 640. Therefore, our halfway between answer of 370 above is correct.

Halfway Between
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