12/5 cannot be simplified.
1 over 12 is simplified
It is: 12/20 = 3/5 simplified
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One
It cannot be simplified. That is the simplest form of the fraction.
Twelve minus seven is five
Seven and five is twelve. If you say, 'seven and five are twelve', you are actually saying that the number 7 is 12, and the number 5 is 12, which is impossible.
One and seven eighths is in its lowest form and cannot be simplified.
It is 12/16, which can be simplified, if required.
12/16 = 3/4
The decimal for seven and twelve hundredths is 7.12