When you ask "What number is halfway between 30 and 219?" 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=219.
To find the number halfway between 30 and 219, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 219 into our formula, we get:
(30 + 219)/2 = 124.5
Thus, the number halfway between 30 and 219 is 124.5.
To check that our answer is correct, we subtract 30 from 124.5 and subtract 124.5 from 219 and compare the two numbers:
124.5 - 30 = 94.5
219 - 124.5 = 94.5
As you can see, the halfway number is 94.5 higher than 30 and 94.5 lower than 219. Therefore, our halfway between answer of 124.5 above is correct.
Halfway Between
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Halfway Between 30 and 220
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