Halfway Between 21 and 691

When you ask "What number is halfway between 21 and 691?" 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=691.

Halfway Between Line

To find the number halfway between 21 and 691, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 691 into our formula, we get:

(21 + 691)/2 = 356

Thus, the number halfway between 21 and 691 is 356.

To check that our answer is correct, we subtract 21 from 356 and subtract 356 from 691 and compare the two numbers:

356 - 21 = 335
691 - 356 = 335

As you can see, the halfway number is 335 higher than 21 and 335 lower than 691. Therefore, our halfway between answer of 356 above is correct.

Halfway Between
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Halfway Between 21 and 692
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