When you ask "What number is halfway between 30 and 69?" 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=69.
To find the number halfway between 30 and 69, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 69 into our formula, we get:
(30 + 69)/2 = 49.5
Thus, the number halfway between 30 and 69 is 49.5.
To check that our answer is correct, we subtract 30 from 49.5 and subtract 49.5 from 69 and compare the two numbers:
49.5 - 30 = 19.5
69 - 49.5 = 19.5
As you can see, the halfway number is 19.5 higher than 30 and 19.5 lower than 69. Therefore, our halfway between answer of 49.5 above is correct.
Halfway Between
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Halfway Between 30 and 70
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