Halfway Between 21 and 509

When you ask "What number is halfway between 21 and 509?" 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=509.

Halfway Between Line

To find the number halfway between 21 and 509, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 509 into our formula, we get:

(21 + 509)/2 = 265

Thus, the number halfway between 21 and 509 is 265.

To check that our answer is correct, we subtract 21 from 265 and subtract 265 from 509 and compare the two numbers:

265 - 21 = 244
509 - 265 = 244

As you can see, the halfway number is 244 higher than 21 and 244 lower than 509. Therefore, our halfway between answer of 265 above is correct.

Halfway Between
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Halfway Between 21 and 510
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