Halfway Between 99 and 521

When you ask "What number is halfway between 99 and 521?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=99 and Y=521.

Halfway Between Line

To find the number halfway between 99 and 521, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 99 and 521 into our formula, we get:

(99 + 521)/2 = 310

Thus, the number halfway between 99 and 521 is 310.

To check that our answer is correct, we subtract 99 from 310 and subtract 310 from 521 and compare the two numbers:

310 - 99 = 211
521 - 310 = 211

As you can see, the halfway number is 211 higher than 99 and 211 lower than 521. Therefore, our halfway between answer of 310 above is correct.

Halfway Between
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Halfway Between 99 and 522
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