Halfway Between 21 and 309

When you ask "What number is halfway between 21 and 309?" 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=309.

Halfway Between Line

To find the number halfway between 21 and 309, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 309 into our formula, we get:

(21 + 309)/2 = 165

Thus, the number halfway between 21 and 309 is 165.

To check that our answer is correct, we subtract 21 from 165 and subtract 165 from 309 and compare the two numbers:

165 - 21 = 144
309 - 165 = 144

As you can see, the halfway number is 144 higher than 21 and 144 lower than 309. Therefore, our halfway between answer of 165 above is correct.

Halfway Between
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Halfway Between 21 and 310
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