Halfway Between 21 and 669

When you ask "What number is halfway between 21 and 669?" 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=669.

Halfway Between Line

To find the number halfway between 21 and 669, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 669 into our formula, we get:

(21 + 669)/2 = 345

Thus, the number halfway between 21 and 669 is 345.

To check that our answer is correct, we subtract 21 from 345 and subtract 345 from 669 and compare the two numbers:

345 - 21 = 324
669 - 345 = 324

As you can see, the halfway number is 324 higher than 21 and 324 lower than 669. Therefore, our halfway between answer of 345 above is correct.

Halfway Between
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Halfway Between 21 and 670
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