When you ask "What number is halfway between 30 and 803?" 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=803.
To find the number halfway between 30 and 803, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 803 into our formula, we get:
(30 + 803)/2 = 416.5
Thus, the number halfway between 30 and 803 is 416.5.
To check that our answer is correct, we subtract 30 from 416.5 and subtract 416.5 from 803 and compare the two numbers:
416.5 - 30 = 386.5
803 - 416.5 = 386.5
As you can see, the halfway number is 386.5 higher than 30 and 386.5 lower than 803. Therefore, our halfway between answer of 416.5 above is correct.
Halfway Between
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Halfway Between 30 and 804
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