Halfway Between 21 and 689

When you ask "What number is halfway between 21 and 689?" 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=689.

Halfway Between Line

To find the number halfway between 21 and 689, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 689 into our formula, we get:

(21 + 689)/2 = 355

Thus, the number halfway between 21 and 689 is 355.

To check that our answer is correct, we subtract 21 from 355 and subtract 355 from 689 and compare the two numbers:

355 - 21 = 334
689 - 355 = 334

As you can see, the halfway number is 334 higher than 21 and 334 lower than 689. Therefore, our halfway between answer of 355 above is correct.

Halfway Between
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Halfway Between 21 and 690
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