Halfway Between 21 and 321

When you ask "What number is halfway between 21 and 321?" 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=321.

Halfway Between Line

To find the number halfway between 21 and 321, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 321 into our formula, we get:

(21 + 321)/2 = 171

Thus, the number halfway between 21 and 321 is 171.

To check that our answer is correct, we subtract 21 from 171 and subtract 171 from 321 and compare the two numbers:

171 - 21 = 150
321 - 171 = 150

As you can see, the halfway number is 150 higher than 21 and 150 lower than 321. Therefore, our halfway between answer of 171 above is correct.

Halfway Between
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Halfway Between 21 and 322
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