To take a mixed or proper fraction and make it an improper fraction simply keep the denominator the same (in this case 10) and multiply it by the whole number (in this case 1) and then add that number to the numerator (in this case 4)
So 10 x 1 = 10 + 4 = 14.
Keeping the denominator the same the improper fraction of 1 and 4/10 would be: 14/10.
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As and improper fraction, 12/10 and as a mixed number 1 and 2/10
It is simply 900/1 as an improper fraction
12/12 = 1 and there is no proper equivalent improper fraction for 1. You could write 1 as 10/n where n is any non-zero integer but that is a completely pointless exercise.
2.1 = 2 + 1/10 = 2 1/10 It can also be written as the improper fraction 21/10
As an improper fraction it is: 9/4