When you ask "What number is halfway between 30 and 457?" 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=457.
To find the number halfway between 30 and 457, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 457 into our formula, we get:
(30 + 457)/2 = 243.5
Thus, the number halfway between 30 and 457 is 243.5.
To check that our answer is correct, we subtract 30 from 243.5 and subtract 243.5 from 457 and compare the two numbers:
243.5 - 30 = 213.5
457 - 243.5 = 213.5
As you can see, the halfway number is 213.5 higher than 30 and 213.5 lower than 457. Therefore, our halfway between answer of 243.5 above is correct.
Halfway Between
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Halfway Between 30 and 458
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