13．口算
0 159578 159586 159592 159596 159602 159604 159608 159614 159616 159622 159628 159632 159634 159638 159644 159646 159652 159656 159658 159662 159664 159668 159670 159672 159673 159674 159676 159677 159678 159680 159682 159686 159688 159692 159694 159698 159704 159706 159712 159716 159718 159722 159728 159734 159736 159742 159746 159748 159754 159758 159764 159772 199269
| 22×40= | 9+14= | 120÷6= | 300+400= | 56÷7= |
| 46+24= | 15+15= | 60×30= | 78+12= | 0÷2= |
| 270-30= | 15×20= | 1600-900= | 11×7= | 50+780= |
| 25+1= | 27÷3= | 32×3= | 72+72= | 10×110= |
| 200×30= | 81÷9= | 60×50= | 0÷9= | 36÷9= |
| 20-5= | 900×200= | 83-9= | 25×2= | 120+300= |
| $\frac{2}{8}$+$\frac{5}{8}$= | 83+9= | 8+68= | 40÷5= | 21×4= |
| 37-37= | 39+6= | 90÷9= | 0+17= | 100-80= |
| 7×4= | $\frac{2}{3}$+$\frac{1}{3}$= | 12×300= | 32-22= | 12×3= |
| 62-13= | 26÷2= | $\frac{3}{7}$+$\frac{4}{7}$= | 24÷2= | $\frac{8}{12}$-$\frac{5}{12}$= |
| 63+11= | 28+2= | 49-12= | 5200-700= | $\frac{9}{10}$-$\frac{5}{10}$= |
| $\frac{4}{5}$-$\frac{4}{5}$= | 56÷8+3= | 5+12= | 0×4÷2= | 26-5×4= |
