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2/5 is the same as 4/10 if you multiply top and bottom by 2
The mixed number 1&3/10 converts to the improper fraction 13/10. You use this formula to convert
a & b/c = (a*c+b)/c
So that means -1&3/10 turns into -13/10.
Now add the fraction -13/10 to 4/10 to get -13/10+4/10 = (-13+4)/10 = -9/10
So the answer as a fraction is -9/10
Note how -4/5 = -8/10 = -0.8 and -9/10 = -0.9
This means that the fraction -9/10 is exactly at the midpoint between the tickmarks "-1" and "-4/5" on the number line.
Check out the image attachment below to see the location of the answer on the number line.