The first level: painting (omitted)

The second level: list method (omitted)

The third level: mathematics in life

1.20×3=60 (yuan)

84-60 = 24 (yuan)

24÷2= 12 (Ben)

20- 12=8 (Ben)

2.208÷26=8 (days)

8× 21=168km

208-168 = 40km

40÷8=5 (days)

8-5=3 (days)

3.40× 10=400 (yuan)

880-400=480 (yuan)

480÷40= 12 (Zhang)

40- 12=28 (sheets)

4. 10×5=50 (ton)

62-50 = 12 (ton)

12÷3=4 (vehicle)

10-4 = 6 (vehicle)

5. 18×3=54 (length)

78-54=24 (length)

24÷2= 12 (barrel)

18- 12=6 (barrel)

6.50×50=2500 (yuan)

4000-2500= 1500 (yuan)

1500/150 =10 (piece)

50- 10=40 (piece)

7. 13× 35 = 455 (yuan)

480-455 = 25 (yuan)

25÷5=5 (piece)

13-5 = 8 (pieces)

8.8×2= 16 (point)

2 1- 16=5 (pieces) 5÷ 1=5 (pieces)

8-5=3 (pieces)

9.20×5= 100 (minutes)

100-68=32 (point)

32÷8=4 (Dao)

20-4= 16 (road)