Halfway Between 21 and 510

When you ask "What number is halfway between 21 and 510?" 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=510.

Halfway Between Line

To find the number halfway between 21 and 510, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 510 into our formula, we get:

(21 + 510)/2 = 265.5

Thus, the number halfway between 21 and 510 is 265.5.

To check that our answer is correct, we subtract 21 from 265.5 and subtract 265.5 from 510 and compare the two numbers:

265.5 - 21 = 244.5
510 - 265.5 = 244.5

As you can see, the halfway number is 244.5 higher than 21 and 244.5 lower than 510. Therefore, our halfway between answer of 265.5 above is correct.

Halfway Between
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Halfway Between 21 and 511
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