When you ask "What number is halfway between 71 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=71 and Y=209.
To find the number halfway between 71 and 209, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 71 and 209 into our formula, we get:
(71 + 209)/2 = 140
Thus, the number halfway between 71 and 209 is 140.
To check that our answer is correct, we subtract 71 from 140 and subtract 140 from 209 and compare the two numbers:
140 - 71 = 69
209 - 140 = 69
As you can see, the halfway number is 69 higher than 71 and 69 lower than 209. Therefore, our halfway between answer of 140 above is correct.
Halfway Between
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Halfway Between 71 and 210
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