Halfway Between 100 and 209

When you ask "What number is halfway between 100 and 209?" 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=209.

Halfway Between Line

To find the number halfway between 100 and 209, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 100 and 209 into our formula, we get:

(100 + 209)/2 = 154.5

Thus, the number halfway between 100 and 209 is 154.5.

To check that our answer is correct, we subtract 100 from 154.5 and subtract 154.5 from 209 and compare the two numbers:

154.5 - 100 = 54.5
209 - 154.5 = 54.5

As you can see, the halfway number is 54.5 higher than 100 and 54.5 lower than 209. Therefore, our halfway between answer of 154.5 above is correct.

Halfway Between
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Halfway Between 100 and 210
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