When you ask "What number is halfway between 31 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=31 and Y=550.
To find the number halfway between 31 and 550, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 550 into our formula, we get:
(31 + 550)/2 = 290.5
Thus, the number halfway between 31 and 550 is 290.5.
To check that our answer is correct, we subtract 31 from 290.5 and subtract 290.5 from 550 and compare the two numbers:
290.5 - 31 = 259.5
550 - 290.5 = 259.5
As you can see, the halfway number is 259.5 higher than 31 and 259.5 lower than 550. Therefore, our halfway between answer of 290.5 above is correct.
Halfway Between
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Halfway Between 31 and 551
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