Halfway Between 21 and 685

When you ask "What number is halfway between 21 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=21 and Y=685.

Halfway Between Line

To find the number halfway between 21 and 685, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 685 into our formula, we get:

(21 + 685)/2 = 353

Thus, the number halfway between 21 and 685 is 353.

To check that our answer is correct, we subtract 21 from 353 and subtract 353 from 685 and compare the two numbers:

353 - 21 = 332
685 - 353 = 332

As you can see, the halfway number is 332 higher than 21 and 332 lower than 685. Therefore, our halfway between answer of 353 above is correct.

Halfway Between
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Halfway Between 21 and 686
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