Halfway Between 15 and 625

When you ask "What number is halfway between 15 and 625?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=625.

Halfway Between Line

To find the number halfway between 15 and 625, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 15 and 625 into our formula, we get:

(15 + 625)/2 = 320

Thus, the number halfway between 15 and 625 is 320.

To check that our answer is correct, we subtract 15 from 320 and subtract 320 from 625 and compare the two numbers:

320 - 15 = 305
625 - 320 = 305

As you can see, the halfway number is 305 higher than 15 and 305 lower than 625. Therefore, our halfway between answer of 320 above is correct.

Halfway Between
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