When you ask "What number is halfway between 4 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=4 and Y=555.
To find the number halfway between 4 and 555, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 555 into our formula, we get:
(4 + 555)/2 = 279.5
Thus, the number halfway between 4 and 555 is 279.5.
To check that our answer is correct, we subtract 4 from 279.5 and subtract 279.5 from 555 and compare the two numbers:
279.5 - 4 = 275.5
555 - 279.5 = 275.5
As you can see, the halfway number is 275.5 higher than 4 and 275.5 lower than 555. Therefore, our halfway between answer of 279.5 above is correct.
Halfway Between
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Halfway Between 4 and 556
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