When you ask "What number is halfway between 30 and 615?" 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=615.
To find the number halfway between 30 and 615, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 615 into our formula, we get:
(30 + 615)/2 = 322.5
Thus, the number halfway between 30 and 615 is 322.5.
To check that our answer is correct, we subtract 30 from 322.5 and subtract 322.5 from 615 and compare the two numbers:
322.5 - 30 = 292.5
615 - 322.5 = 292.5
As you can see, the halfway number is 292.5 higher than 30 and 292.5 lower than 615. Therefore, our halfway between answer of 322.5 above is correct.
Halfway Between
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Halfway Between 30 and 616
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