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The fifth grade math workbook page 454647 answers.
The answer to the fifth grade math exercise book in primary school

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.