When you ask "What number is halfway between 51 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=51 and Y=209.
To find the number halfway between 51 and 209, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 209 into our formula, we get:
(51 + 209)/2 = 130
Thus, the number halfway between 51 and 209 is 130.
To check that our answer is correct, we subtract 51 from 130 and subtract 130 from 209 and compare the two numbers:
130 - 51 = 79
209 - 130 = 79
As you can see, the halfway number is 79 higher than 51 and 79 lower than 209. Therefore, our halfway between answer of 130 above is correct.
Halfway Between
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Halfway Between 51 and 210
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