When you ask "What number is halfway between 55 and 550?" 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=550.
To find the number halfway between 55 and 550, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 550 into our formula, we get:
(55 + 550)/2 = 302.5
Thus, the number halfway between 55 and 550 is 302.5.
To check that our answer is correct, we subtract 55 from 302.5 and subtract 302.5 from 550 and compare the two numbers:
302.5 - 55 = 247.5
550 - 302.5 = 247.5
As you can see, the halfway number is 247.5 higher than 55 and 247.5 lower than 550. Therefore, our halfway between answer of 302.5 above is correct.
Halfway Between
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Halfway Between 55 and 551
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