Add and subtract decimals including negatives

Line up the decimal points to add or subtract. The sign rules are the same as for integers.

1. Evaluate: 6.3 − (−8.1)
2. Evaluate: 9.2 + 6.3
3. Evaluate: 3.5 + 8.5
4. Evaluate: 5.6 + (−8.0)
5. Evaluate: 3.2 + (−12.9)
6. Evaluate: 10.5 − (−10.8)
7. Evaluate: 1.4 + 11.8
8. Evaluate: −1.8 + 8.9
9. Evaluate: −8.4 + 14.76
10. Evaluate: −12.3 + (−4.37)
11. Evaluate: −14.3 − 8.32
12. Evaluate: −15.7 − 10.95
13. Evaluate: −29.3 − (−19.61)
14. Evaluate: 20.1 − (−31.79)
15. Evaluate: −30.3 + 1.90
16. Evaluate: −3.5 + (−6.91)
17. Evaluate: 48.7 − 72.64
18. Evaluate: −46.1 − (−13.83)
19. Evaluate: −39.8 − 66.60
20. Evaluate: 39.2 − 43.46