When you ask "What number is halfway between 30 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=30 and Y=216.
To find the number halfway between 30 and 216, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 216 into our formula, we get:
(30 + 216)/2 = 123
Thus, the number halfway between 30 and 216 is 123.
To check that our answer is correct, we subtract 30 from 123 and subtract 123 from 216 and compare the two numbers:
123 - 30 = 93
216 - 123 = 93
As you can see, the halfway number is 93 higher than 30 and 93 lower than 216. Therefore, our halfway between answer of 123 above is correct.
Halfway Between
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Halfway Between 30 and 217
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