Halfway Between 21 and 677

When you ask "What number is halfway between 21 and 677?" 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=677.

Halfway Between Line

To find the number halfway between 21 and 677, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 677 into our formula, we get:

(21 + 677)/2 = 349

Thus, the number halfway between 21 and 677 is 349.

To check that our answer is correct, we subtract 21 from 349 and subtract 349 from 677 and compare the two numbers:

349 - 21 = 328
677 - 349 = 328

As you can see, the halfway number is 328 higher than 21 and 328 lower than 677. Therefore, our halfway between answer of 349 above is correct.

Halfway Between
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Halfway Between 21 and 678
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