Halfway Between 100 and 421

When you ask "What number is halfway between 100 and 421?" 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=421.

Halfway Between Line

To find the number halfway between 100 and 421, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 100 and 421 into our formula, we get:

(100 + 421)/2 = 260.5

Thus, the number halfway between 100 and 421 is 260.5.

To check that our answer is correct, we subtract 100 from 260.5 and subtract 260.5 from 421 and compare the two numbers:

260.5 - 100 = 160.5
421 - 260.5 = 160.5

As you can see, the halfway number is 160.5 higher than 100 and 160.5 lower than 421. Therefore, our halfway between answer of 260.5 above is correct.

Halfway Between
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Halfway Between 100 and 422
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