9 and 10's Addition (Mixed)

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1. 10+9=
2. 3+9=
3. 9+1=
4. 1+10=
5. 10+2=
6. 5+10=
7. 3+10=
8. 9+0=
9. 2+9=
10. 5+9=
11. 10+5=
12. 9+6=
13. 8+9=
14. 9+10=
15. 4+10=
16. 6+10=
17. 10+8=
18. 9+7=
19. 9+9=
20. 4+9=