Subtract fractions with negatives and the same denominator

Give the answer as a fraction in lowest terms, or a whole number.

1. Evaluate: −4/10 − (−4/10) (Write a fraction in lowest terms, or a whole number.)
2. Evaluate: 5/10 − 9/10 (Write a fraction in lowest terms, or a whole number.)
3. Evaluate: −4/5 − (−1/5) (Write a fraction in lowest terms, or a whole number.)
4. Evaluate: 2/5 − 2/5 (Write a fraction in lowest terms, or a whole number.)
5. Evaluate: −3/4 − (−3/4) (Write a fraction in lowest terms, or a whole number.)
6. Evaluate: −4/6 − (−3/6) (Write a fraction in lowest terms, or a whole number.)
7. Evaluate: −3/4 − 3/4 (Write a fraction in lowest terms, or a whole number.)
8. Evaluate: −1/3 − (−2/3) (Write a fraction in lowest terms, or a whole number.)
9. Evaluate: −1/4 − 3/4 (Write a fraction in lowest terms, or a whole number.)
10. Evaluate: 5/7 − (−4/7) (Write a fraction in lowest terms, or a whole number.)
11. Evaluate: −1/9 − 6/9 (Write a fraction in lowest terms, or a whole number.)
12. Evaluate: −5/8 − 2/8 (Write a fraction in lowest terms, or a whole number.)
13. Evaluate: 1/2 − (−1/2) (Write a fraction in lowest terms, or a whole number.)
14. Evaluate: −1/3 − 2/3 (Write a fraction in lowest terms, or a whole number.)
15. Evaluate: −3/9 − 3/9 (Write a fraction in lowest terms, or a whole number.)
16. Evaluate: 2/5 − 1/5 (Write a fraction in lowest terms, or a whole number.)
17. Evaluate: −1/2 − 1/2 (Write a fraction in lowest terms, or a whole number.)
18. Evaluate: −7/12 − (−2/12) (Write a fraction in lowest terms, or a whole number.)
19. Evaluate: 3/4 − (−2/4) (Write a fraction in lowest terms, or a whole number.)
20. Evaluate: 7/10 − (−4/10) (Write a fraction in lowest terms, or a whole number.)