Halfway Between 15 and 685

When you ask "What number is halfway between 15 and 685?" 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=685.

Halfway Between Line

To find the number halfway between 15 and 685, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 15 and 685 into our formula, we get:

(15 + 685)/2 = 350

Thus, the number halfway between 15 and 685 is 350.

To check that our answer is correct, we subtract 15 from 350 and subtract 350 from 685 and compare the two numbers:

350 - 15 = 335
685 - 350 = 335

As you can see, the halfway number is 335 higher than 15 and 335 lower than 685. Therefore, our halfway between answer of 350 above is correct.

Halfway Between
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Halfway Between 15 and 686
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