Printable addition worksheets within 20 – grade 6 (hard) worksheet for kids. Free PDF download and answer key included.
1. 8 + 7 = ___
2. 15 + 4 = ___
3. 9 + 11 = ___
4. 13 + 6 = ___
5. 7 + 14 = ___
6. 12 + 8 = ___
7. 5 + 16 = ___
8. 18 + 2 = ___
9. 6 + 15 = ___
10. 11 + 9 = ___
11. 4 + 17 = ___
12. 14 + 5 = ___
13. 8 + 12 = ___
14. 16 + 3 = ___
15. 7 + 13 = ___