So you have to make 1 into an expression whereby the denominator is 10 also. 10/10 is 1 so this works well. 10/10-3/10 is 7/10.
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4/5 1.3 means 1 plus 3 tenths. 1 is ten tenths. So the total is thirteen tenths 13/10. This process is called creating a common denominator ( in this case, everything in tenths). 4/5 is eight tenths 8/10, i.e. 0.8
1/5 1/2 + (-3/10) is the same as 1/2 - 3/10 so 5/10 - 3/10 = 2/10 = 1/5
30%
Three tenths (3/10) as a percentage is written as 30%. In decimal form it would be written as ".3".
-3 - -1 = -2 -3 + -1 = -2 When you are subtracting a negative from a negative it becomes a positive. For example 6 - -2 = 8 but 6 + -2 = 4. The two negatives cancel each other out and become a positive.