1, fractional multiplication, fractional multiplication by integer, I'll fill it in.

(1)2/3 plus 2/3 plus 2/3=2/3×3=2.

(2)4/7+4/7+4/7=4/7×3= 12/7

2. A ruler is 3/ 10 meter long. 3/ 10×3=9/ 10 I will calculate 21/425/395/38/1328154/316/32/.

2. See the addition formula in the table: 9/10+9/10+9/10+9/10 = 9/2 Multiplication formula: 9/ 10 × 5.

3. Column calculation. What is the sum of (1)3 8/3? What is 2/5+3/8 = 9/8 (2)15 of 3/8? What is the triple of 15×2/5=6 (3)4/7? 4/7×3= 12/7

1, Xiaojun drinks 3/5 cups of juice every night. How many glasses of juice does he drink a week? 1 week =7 days 3/5×7=2 1/5 (cups) A: He drinks 2 1/5 cups a week.

2. The whole school 18 classes, if each class saves 3/7kg of paper. According to this calculation, how many kilograms of paper can the whole school save in a week? 3/7× 18=54/7 a week =7 days 54/7×7=54(kg) A: The whole school can save 54kg of paper a week.

3. When a car travels from A to B, it travels every hour118. A fraction of a six-hour journey? 118× 6 = 1/3a: the whole journey in 6 hours1/3.

The thickness of newspaper is about 2/5mm. 100 newspapers are stacked together. What is the thickness? 2/5×100 = 40 (mm) 40mm = 4cma: 4cm thick.