When you ask "What number is halfway between 31 and 221?" 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=221.
To find the number halfway between 31 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 221 into our formula, we get:
(31 + 221)/2 = 126
Thus, the number halfway between 31 and 221 is 126.
To check that our answer is correct, we subtract 31 from 126 and subtract 126 from 221 and compare the two numbers:
126 - 31 = 95
221 - 126 = 95
As you can see, the halfway number is 95 higher than 31 and 95 lower than 221. Therefore, our halfway between answer of 126 above is correct.
Halfway Between
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Halfway Between 31 and 222
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