When you ask "What number is halfway between 31 and 231?" 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=231.
To find the number halfway between 31 and 231, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 231 into our formula, we get:
(31 + 231)/2 = 131
Thus, the number halfway between 31 and 231 is 131.
To check that our answer is correct, we subtract 31 from 131 and subtract 131 from 231 and compare the two numbers:
131 - 31 = 100
231 - 131 = 100
As you can see, the halfway number is 100 higher than 31 and 100 lower than 231. Therefore, our halfway between answer of 131 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 31 and 232
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