Brug met tienvoud

Hoofdmenu Eentje per keer  🖨

Reken uit

1. \(80 + 19 = \ldots\)
2. \(20 + 55 = \ldots\)
3. \(70 + 13 = \ldots\)
4. \(29 + 60 = \ldots\)
5. \(39 + 40 = \ldots\)
6. \(0 + 94 = \ldots\)
7. \(51 + 40 = \ldots\)
8. \(40 + 43 = \ldots\)
9. \(10 + 57 = \ldots\)
10. \(10 + 74 = \ldots\)
11. \(30 + 57 = \ldots\)
12. \(85 + 10 = \ldots\)

---

Reken uit

Verbetersleutel

1. \(\begin{align} & 80 + 19 \\= & 80 + \color{green}{10} + \color{red}{9} \\ = & \color{green}{90} + \color{red}{9} \\ = & \color{red}{99} \end{align}\)
2. \(\begin{align} & 20 + 55 \\= & 20 + \color{green}{50} + \color{red}{5} \\ = & \color{green}{70} + \color{red}{5} \\ = & \color{red}{75} \end{align}\)
3. \(\begin{align} & 70 + 13 \\= & 70 + \color{green}{10} + \color{red}{3} \\ = & \color{green}{80} + \color{red}{3} \\ = & \color{red}{83} \end{align}\)
4. \(\begin{align} & 29 + 60 \\ = & 60 + 29 \\= & 60 + \color{green}{20} + \color{red}{9} \\ = & \color{green}{80} + \color{red}{9} \\ = & \color{red}{89} \end{align}\)
5. \(\begin{align} & 39 + 40 \\ = & 40 + 39 \\= & 40 + \color{green}{30} + \color{red}{9} \\ = & \color{green}{70} + \color{red}{9} \\ = & \color{red}{79} \end{align}\)
6. \(\begin{align} & 0 + 94 \\= & 0 + \color{green}{90} + \color{red}{4} \\ = & \color{green}{90} + \color{red}{4} \\ = & \color{red}{94} \end{align}\)
7. \(\begin{align} & 51 + 40 \\ = & 40 + 51 \\= & 40 + \color{green}{50} + \color{red}{1} \\ = & \color{green}{90} + \color{red}{1} \\ = & \color{red}{91} \end{align}\)
8. \(\begin{align} & 40 + 43 \\= & 40 + \color{green}{40} + \color{red}{3} \\ = & \color{green}{80} + \color{red}{3} \\ = & \color{red}{83} \end{align}\)
9. \(\begin{align} & 10 + 57 \\= & 10 + \color{green}{50} + \color{red}{7} \\ = & \color{green}{60} + \color{red}{7} \\ = & \color{red}{67} \end{align}\)
10. \(\begin{align} & 10 + 74 \\= & 10 + \color{green}{70} + \color{red}{4} \\ = & \color{green}{80} + \color{red}{4} \\ = & \color{red}{84} \end{align}\)
11. \(\begin{align} & 30 + 57 \\= & 30 + \color{green}{50} + \color{red}{7} \\ = & \color{green}{80} + \color{red}{7} \\ = & \color{red}{87} \end{align}\)
12. \(\begin{align} & 85 + 10 \\ = & 10 + 85 \\= & 10 + \color{green}{80} + \color{red}{5} \\ = & \color{green}{90} + \color{red}{5} \\ = & \color{red}{95} \end{align}\)