When you ask "What number is halfway between 30 and 189?" 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=189.
To find the number halfway between 30 and 189, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 189 into our formula, we get:
(30 + 189)/2 = 109.5
Thus, the number halfway between 30 and 189 is 109.5.
To check that our answer is correct, we subtract 30 from 109.5 and subtract 109.5 from 189 and compare the two numbers:
109.5 - 30 = 79.5
189 - 109.5 = 79.5
As you can see, the halfway number is 79.5 higher than 30 and 79.5 lower than 189. Therefore, our halfway between answer of 109.5 above is correct.
Halfway Between
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Halfway Between 30 and 190
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