When you ask "What number is halfway between 90 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=90 and Y=209.
To find the number halfway between 90 and 209, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 209 into our formula, we get:
(90 + 209)/2 = 149.5
Thus, the number halfway between 90 and 209 is 149.5.
To check that our answer is correct, we subtract 90 from 149.5 and subtract 149.5 from 209 and compare the two numbers:
149.5 - 90 = 59.5
209 - 149.5 = 59.5
As you can see, the halfway number is 59.5 higher than 90 and 59.5 lower than 209. Therefore, our halfway between answer of 149.5 above is correct.
Halfway Between
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Halfway Between 90 and 210
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