3 and 1/10 - 2 and 1/5
change to improper fractions as difficulty with negative numbers can be avoided by just changing the 1/10 and 1/5 fractions to common denominator.
31/10 - 11/5
change denominator to common 10
31/10 - 22/10
= 9/10
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one and one tenth
21
2/5 plus 1/5 minus 3/10 is equal to 0.3 or 3/10
99/20 or 4.95
It is: 3/10 = three tenths