Halfway Between 100 and 518

When you ask "What number is halfway between 100 and 518?" 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=518.

Halfway Between Line

To find the number halfway between 100 and 518, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 100 and 518 into our formula, we get:

(100 + 518)/2 = 309

Thus, the number halfway between 100 and 518 is 309.

To check that our answer is correct, we subtract 100 from 309 and subtract 309 from 518 and compare the two numbers:

309 - 100 = 209
518 - 309 = 209

As you can see, the halfway number is 209 higher than 100 and 209 lower than 518. Therefore, our halfway between answer of 309 above is correct.

Halfway Between
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Halfway Between 100 and 519
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