When you ask "What number is halfway between 30 and 455?" 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=455.
To find the number halfway between 30 and 455, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 455 into our formula, we get:
(30 + 455)/2 = 242.5
Thus, the number halfway between 30 and 455 is 242.5.
To check that our answer is correct, we subtract 30 from 242.5 and subtract 242.5 from 455 and compare the two numbers:
242.5 - 30 = 212.5
455 - 242.5 = 212.5
As you can see, the halfway number is 212.5 higher than 30 and 212.5 lower than 455. Therefore, our halfway between answer of 242.5 above is correct.
Halfway Between
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Halfway Between 30 and 456
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