10 - 20

Hoofdmenu Eentje per keer  🖨

Reken uit

1. \(4 + \color{red}{15} = \)
2. \(8 + \color{red}{5} = \)
3. \(2 + \color{red}{17} = \)
4. \(7 + \color{red}{6} = \)
5. \(2 + \color{red}{15} = \)
6. \(8 + \color{red}{11} = \)
7. \(4 + \color{red}{12} = \)
8. \(8 + \color{red}{10} = \)
9. \(4 + \color{red}{11} = \)
10. \(3 + \color{red}{8} = \)
11. \(2 + \color{red}{11} = \)
12. \(6 + \color{red}{13} = \)

---

Reken uit

Verbetersleutel

1. \(4 + \color{red}{15} = \color{red}{15} + 4 = 19\)
2. \(8 + \color{red}{5} = 8 + \color{red}{2} \color{red}{ + } \color{red}{3} = 13\)
3. \(2 + \color{red}{17} = \color{red}{17} + 2 = 19\)
4. \(7 + \color{red}{6} = 7 + \color{red}{3} \color{red}{ + } \color{red}{3} = 13\)
5. \(2 + \color{red}{15} = \color{red}{15} + 2 = 17\)
6. \(8 + \color{red}{11} = \color{red}{11} + 8 = 19\)
7. \(4 + \color{red}{12} = \color{red}{12} + 4 = 16\)
8. \(8 + \color{red}{10} = \color{red}{10} + 8 = 18\)
9. \(4 + \color{red}{11} = \color{red}{11} + 4 = 15\)
10. \(3 + \color{red}{8} = 8 + \color{green}{3} = 8 + \color{green}{2 + 1} = 11\)
11. \(2 + \color{red}{11} = \color{red}{11} + 2 = 13\)
12. \(6 + \color{red}{13} = \color{red}{13} + 6 = 19\)