When you ask "What number is halfway between 55 and 555?" 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=555.
To find the number halfway between 55 and 555, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 555 into our formula, we get:
(55 + 555)/2 = 305
Thus, the number halfway between 55 and 555 is 305.
To check that our answer is correct, we subtract 55 from 305 and subtract 305 from 555 and compare the two numbers:
305 - 55 = 250
555 - 305 = 250
As you can see, the halfway number is 250 higher than 55 and 250 lower than 555. Therefore, our halfway between answer of 305 above is correct.
Halfway Between
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Halfway Between 55 and 556
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