Sumes per càlcul mental.
__1. 2+6 +7 =A. 16
__2. 3+2 +1 =B. 19
__3. 3+3 +1 =C. 11
__4. 5+0 +6 =D. 12
__5. 6+2 +4 =E. 7
__6. 7+4+7 =F. 18
__7. 7+7+2 =G. 14
__8. 8+6 +6 =H. 15
__9. 9+4 +6 =I. 6
__10. 9+5 +0 =J. 20
__11. 2+2 +5 =A. 15
__12. 3+1 +7 =B. 14
__13. 3+4 +8 =C. 15
__14. 3+6 +0 =D. 9
__15. 4+2 +9 =E. 9
__16. 5+9 +0 =F. 17
__17. 6+1 +7 =G. 18
__18. 7+6 +4 =H. 11
__19. 8+1 +9 =I. 16
__20. 9+7 +0 =J. 14
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