When you ask "What number is halfway between 30 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=30 and Y=209.
To find the number halfway between 30 and 209, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 209 into our formula, we get:
(30 + 209)/2 = 119.5
Thus, the number halfway between 30 and 209 is 119.5.
To check that our answer is correct, we subtract 30 from 119.5 and subtract 119.5 from 209 and compare the two numbers:
119.5 - 30 = 89.5
209 - 119.5 = 89.5
As you can see, the halfway number is 89.5 higher than 30 and 89.5 lower than 209. Therefore, our halfway between answer of 119.5 above is correct.
Halfway Between
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Halfway Between 30 and 210
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