When you ask "What number is halfway between 31 and 290?" 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=290.
To find the number halfway between 31 and 290, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 290 into our formula, we get:
(31 + 290)/2 = 160.5
Thus, the number halfway between 31 and 290 is 160.5.
To check that our answer is correct, we subtract 31 from 160.5 and subtract 160.5 from 290 and compare the two numbers:
160.5 - 31 = 129.5
290 - 160.5 = 129.5
As you can see, the halfway number is 129.5 higher than 31 and 129.5 lower than 290. Therefore, our halfway between answer of 160.5 above is correct.
Halfway Between
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Halfway Between 31 and 291
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