When you ask "What number is halfway between 10 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=10 and Y=209.
To find the number halfway between 10 and 209, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 209 into our formula, we get:
(10 + 209)/2 = 109.5
Thus, the number halfway between 10 and 209 is 109.5.
To check that our answer is correct, we subtract 10 from 109.5 and subtract 109.5 from 209 and compare the two numbers:
109.5 - 10 = 99.5
209 - 109.5 = 99.5
As you can see, the halfway number is 99.5 higher than 10 and 99.5 lower than 209. Therefore, our halfway between answer of 109.5 above is correct.
Halfway Between
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Halfway Between 10 and 210
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