One way: -1.3 = -1.3/1
Multiply by 10/10 to get -13/10.
Also, if you like mixed numbers: -1.3 = -1 3/10.
For a common fraction, -(10*1+3)/10 = -13/10
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13 is an integer and not a fraction. However, it can be expressed in rational form as 13/1.