10 - 20

Hoofdmenu Eentje per keer  🖨

Reken uit

1. \(8 + \color{red}{9} = \)
2. \(8 + \color{red}{8} = \)
3. \(9 + \color{red}{8} = \)
4. \(4 + \color{red}{10} = \)
5. \(7 + \color{red}{13} = \)
6. \(6 + \color{red}{14} = \)
7. \(2 + \color{red}{18} = \)
8. \(9 + \color{red}{10} = \)
9. \(7 + \color{red}{11} = \)
10. \(9 + \color{red}{7} = \)
11. \(9 + \color{red}{9} = \)
12. \(8 + \color{red}{10} = \)

---

Reken uit

Verbetersleutel

1. \(8 + \color{red}{9} = 9 + \color{green}{8} = 9 + \color{green}{1 + 7} = 17\)
2. \(8 + \color{red}{8} = 8 + \color{red}{2} \color{red}{ + } \color{red}{6} = 16\)
3. \(9 + \color{red}{8} = 9 + \color{red}{1} \color{red}{ + } \color{red}{7} = 17\)
4. \(4 + \color{red}{10} = \color{red}{10} + 4 = 14\)
5. \(7 + \color{red}{13} = \color{red}{13} + 7 = 20\)
6. \(6 + \color{red}{14} = \color{red}{14} + 6 = 20\)
7. \(2 + \color{red}{18} = \color{red}{18} + 2 = 20\)
8. \(9 + \color{red}{10} = \color{red}{10} + 9 = 19\)
9. \(7 + \color{red}{11} = \color{red}{11} + 7 = 18\)
10. \(9 + \color{red}{7} = 9 + \color{red}{1} \color{red}{ + } \color{red}{6} = 16\)
11. \(9 + \color{red}{9} = 9 + \color{red}{1} \color{red}{ + } \color{red}{8} = 18\)
12. \(8 + \color{red}{10} = \color{red}{10} + 8 = 18\)