Halfway Between 100 and 821

When you ask "What number is halfway between 100 and 821?" 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=821.

Halfway Between Line

To find the number halfway between 100 and 821, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 100 and 821 into our formula, we get:

(100 + 821)/2 = 460.5

Thus, the number halfway between 100 and 821 is 460.5.

To check that our answer is correct, we subtract 100 from 460.5 and subtract 460.5 from 821 and compare the two numbers:

460.5 - 100 = 360.5
821 - 460.5 = 360.5

As you can see, the halfway number is 360.5 higher than 100 and 360.5 lower than 821. Therefore, our halfway between answer of 460.5 above is correct.

Halfway Between
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Halfway Between 100 and 822
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