Corrigé :

1. \( 458 + 372 = 830 \)
2. \( 1032 + 689 = 1721 \)
3. \( 5471 + 2486 = 7957 \)
4. \( 912 - 478 = 434 \)
5. \( 3045 - 1690 = 1355 \)
6. \( 8700 - 3250 = 5450 \)
7. \( 35 \times 24 = 840 \)
8. \( 124 \times 13 = 1612 \)
9. \( 408 \times 16 = 6528 \)
10. \( 936 \div 6 = 156 \)
11. \( 126{,}9 \div 4{,}3 = 29{,}5 \)
12. \( 864 \div 36 = 24 \)