231/100
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To turn 2.31 into a simple fraction, we can first ignore the decimal and consider it as the number 231. Then, we need to find the appropriate place value for the decimal, which is hundredths. So, 2.31 can be written as 231/100.
85 into a fraction = 85/1
231/1000
100/231
It is: 23.1 = 231/10 as an improper fraction
231 can only go into 28 as a fraction (28/231 which simplifies to 4/33).