Halfway Between 100 and 321

When you ask "What number is halfway between 100 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=100 and Y=321.

Halfway Between Line

To find the number halfway between 100 and 321, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 100 and 321 into our formula, we get:

(100 + 321)/2 = 210.5

Thus, the number halfway between 100 and 321 is 210.5.

To check that our answer is correct, we subtract 100 from 210.5 and subtract 210.5 from 321 and compare the two numbers:

210.5 - 100 = 110.5
321 - 210.5 = 110.5

As you can see, the halfway number is 110.5 higher than 100 and 110.5 lower than 321. Therefore, our halfway between answer of 210.5 above is correct.

Halfway Between
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Halfway Between 100 and 322
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