When you ask "What number is halfway between 90 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=90 and Y=455.
To find the number halfway between 90 and 455, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 455 into our formula, we get:
(90 + 455)/2 = 272.5
Thus, the number halfway between 90 and 455 is 272.5.
To check that our answer is correct, we subtract 90 from 272.5 and subtract 272.5 from 455 and compare the two numbers:
272.5 - 90 = 182.5
455 - 272.5 = 182.5
As you can see, the halfway number is 182.5 higher than 90 and 182.5 lower than 455. Therefore, our halfway between answer of 272.5 above is correct.
Halfway Between
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Halfway Between 90 and 456
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