When you ask "What number is halfway between 51 and 216?" 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=216.
To find the number halfway between 51 and 216, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 216 into our formula, we get:
(51 + 216)/2 = 133.5
Thus, the number halfway between 51 and 216 is 133.5.
To check that our answer is correct, we subtract 51 from 133.5 and subtract 133.5 from 216 and compare the two numbers:
133.5 - 51 = 82.5
216 - 133.5 = 82.5
As you can see, the halfway number is 82.5 higher than 51 and 82.5 lower than 216. Therefore, our halfway between answer of 133.5 above is correct.
Halfway Between
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Halfway Between 51 and 217
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