pa helpppppp helpppppp (Find The Difference and Express Your Answer In Lowest Term.)

Find the difference and express your answer in lowest term.
1. 18/18-11/18
2.15/12-3/12
3. 10/12-5/12
4. 13/21-8/21
5. 9/9-3/9
1. 7/18
2. 1
3. 5/12
4. 13/21
5. ⅔
Always remember in subtracting a fraction, subtract the numerator and always copy the denominator. The numerator is always the lowest than the denominator.
________________________________
Hope it's help!