1. 直接写得数。
$120×8= $
$30×20= $
$300÷6= $
$800÷8= $
$99÷9= $
$90×6= $
$110×7= $
$22×50= $
$72÷3= $
$91+8×3= $
$31×20= $
$24×5= $
$8×25= $
$412÷2= $
$400÷5×4= $
$\dfrac{9}{10}-\dfrac{7}{10}= $
$\dfrac{2}{3}+\dfrac{1}{3}= $
$\dfrac{7}{8}-\dfrac{4}{8}= $
$1-\dfrac{5}{9}= $
$\dfrac{2}{7}+\dfrac{4}{7}= $
$132×30= $
$421×20= $
$302×40= $
$500×12= $
$7.5-5= $
$1.5-0.3= $
$9-3.3= $
$7.2-5.2= $

1. $120×8=960$
2. $30×20=600$
3. $300÷6=50$
4. $800÷8=100$
5. $99÷9=11$
6. $90×6=540$
7. $110×7=770$
8. $22×50=1100$
9. $72÷3=24$
10. $91+8×3=91+24=115$
11. $31×20=620$
12. $24×5=120$
13. $8×25=200$
14. $412÷2=206$
15. $400÷5×4=80×4=320$
16. $\dfrac{9}{10}-\dfrac{7}{10}=\dfrac{2}{10}=\dfrac{1}{5}$
17. $\dfrac{2}{3}+\dfrac{1}{3}=1$
18. $\dfrac{7}{8}-\dfrac{4}{8}=\dfrac{3}{8}$
19. $1-\dfrac{5}{9}=\dfrac{4}{9}$
20. $\dfrac{2}{7}+\dfrac{4}{7}=\dfrac{6}{7}$
21. $132×30=3960$
22. $421×20=8420$
23. $302×40=12080$
24. $500×12=6000$
25. $7.5-5=2.5$
26. $1.5-0.3=1.2$
27. $9-3.3=5.7$
28. $7.2-5.2=2$

2. 列竖式计算。(带“☆”的要验算。)
$570÷5=$
$90×28=$
☆ $253÷5=$
$38×77=$
$718÷9=$
☆ $46×17=$
$491×27=$
☆ $296×39=$
$204×56=$
$1.6+2.3=$
☆ $5.9-3.4=$
$0.8+0.6=$