When you ask "What number is halfway between 55 and 490?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=55 and Y=490.
To find the number halfway between 55 and 490, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 490 into our formula, we get:
(55 + 490)/2 = 272.5
Thus, the number halfway between 55 and 490 is 272.5.
To check that our answer is correct, we subtract 55 from 272.5 and subtract 272.5 from 490 and compare the two numbers:
272.5 - 55 = 217.5
490 - 272.5 = 217.5
As you can see, the halfway number is 217.5 higher than 55 and 217.5 lower than 490. Therefore, our halfway between answer of 272.5 above is correct.
Halfway Between
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Halfway Between 55 and 491
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