# Brug met tienvoud

#### Reken uit

1. $$37 + 40 = \ldots$$
2. $$30 + 42 = \ldots$$
3. $$38 + 50 = \ldots$$
4. $$30 + 19 = \ldots$$
5. $$50 + 25 = \ldots$$
6. $$60 + 31 = \ldots$$
7. $$60 + 37 = \ldots$$
8. $$12 + 70 = \ldots$$
9. $$10 + 83 = \ldots$$
10. $$36 + 20 = \ldots$$
11. $$20 + 55 = \ldots$$
12. $$46 + 30 = \ldots$$

#### Reken uit

##### Verbetersleutel

1. \begin{align} & 37 + 40 \\ = & 40 + 37 \\= & 40 + \color{green}{30} + \color{red}{7} \\ = & \color{green}{70} + \color{red}{7} \\ = & \color{red}{77} \end{align}
2. \begin{align} & 30 + 42 \\= & 30 + \color{green}{40} + \color{red}{2} \\ = & \color{green}{70} + \color{red}{2} \\ = & \color{red}{72} \end{align}
3. \begin{align} & 38 + 50 \\ = & 50 + 38 \\= & 50 + \color{green}{30} + \color{red}{8} \\ = & \color{green}{80} + \color{red}{8} \\ = & \color{red}{88} \end{align}
4. \begin{align} & 30 + 19 \\= & 30 + \color{green}{10} + \color{red}{9} \\ = & \color{green}{40} + \color{red}{9} \\ = & \color{red}{49} \end{align}
5. \begin{align} & 50 + 25 \\= & 50 + \color{green}{20} + \color{red}{5} \\ = & \color{green}{70} + \color{red}{5} \\ = & \color{red}{75} \end{align}
6. \begin{align} & 60 + 31 \\= & 60 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{90} + \color{red}{1} \\ = & \color{red}{91} \end{align}
7. \begin{align} & 60 + 37 \\= & 60 + \color{green}{30} + \color{red}{7} \\ = & \color{green}{90} + \color{red}{7} \\ = & \color{red}{97} \end{align}
8. \begin{align} & 12 + 70 \\ = & 70 + 12 \\= & 70 + \color{green}{10} + \color{red}{2} \\ = & \color{green}{80} + \color{red}{2} \\ = & \color{red}{82} \end{align}
9. \begin{align} & 10 + 83 \\= & 10 + \color{green}{80} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}
10. \begin{align} & 36 + 20 \\ = & 20 + 36 \\= & 20 + \color{green}{30} + \color{red}{6} \\ = & \color{green}{50} + \color{red}{6} \\ = & \color{red}{56} \end{align}
11. \begin{align} & 20 + 55 \\= & 20 + \color{green}{50} + \color{red}{5} \\ = & \color{green}{70} + \color{red}{5} \\ = & \color{red}{75} \end{align}
12. \begin{align} & 46 + 30 \\ = & 30 + 46 \\= & 30 + \color{green}{40} + \color{red}{6} \\ = & \color{green}{70} + \color{red}{6} \\ = & \color{red}{76} \end{align}
Oefeningengenerator vanhoeckes.be/wiskunde 2024-08-09 04:18:10