3∶8=(3/8)=(6)÷( 16)= 12∶(32)=(9)∶24

1 3/4 of the meter is (0,75) meters; 2/5 kg is 1 kg (2/5); (9) 1/3 One ton is 3 tons.

4. The side length ratio of the two cubes is 3∶2, and the surface area ratio of the two cubes is (9; 4), the volume ratio of large and small cubes (27; 8)

5. If the number of girls accounts for 4/5 of the number of boys, the ratio of girls to boys is (4; 5), the number of boys accounts for (5; 9)。

6, a book, read 1/6 every day, (6) days to finish reading.

7. 3/4 of a number is equal to 2/3 of b number. If the number A is 90, then the number B is (45).

8. A pile of sand, carrying away 3/4 of it, exactly 24 tons. This pile of sand has (32) tons.

9. Make an isosceles triangle with a 35cm-long iron wire. If the waist-bottom length ratio is 3∶ 1, the waist length is (15) cm.

Multiple choice question:

1, the latter term of a ratio is 8, the ratio is 3/4, and the former term of this ratio is (c).

a、4 B、3？ c、6

2. "A is smaller than B 1/5", and (a) should be regarded as the unit "1". ?

A, b, a, c, not sure

3, a section, a car 9 hours, b car 3 hours, the speed ratio of the two cars is (C).

a、9∶3 B、3∶3 C、 1∶3

4. In the following formula, the biggest result is (a).

a、34:2 B、34÷4 C、6÷34

5. Put 20g of salt into100g of water, and the ratio of salt to brine is (a).

a、 1∶6？ b、 1∶5？ c、6∶ 1

True or false:

1, Happy Football Team beat Houmu Team 3-0, indicating that under special circumstances, the last item of the score can be 0. (10)

2.0m 1/4 equals 4m 1/4. (10)

3. When two fractions are divided, the quotient must be greater than the dividend. (10)

4. If A is 1/5 of B, then B is five times that of A ...

5、4÷(20+4)=4÷20+4÷5=0+5=5 。 (10)

6. The former term of a ratio is multiplied by 1/4, and the latter term is divided by 4, and the ratio remains unchanged. (? )

Solve the problem:

1. Xiao Wei and Xiaoying donated 7: 8 to the Hope Project, and they donated a total of 75 yuan. How much did Xiao Wei and Xiaoying each donate? 75/(7+8)=5 ? 5×7=35= Xiao Wei? 5×8=45= Xiaoying

2. The distance between the two places is 480 kilometers. Two cars, A and B, leave the two places at the same time and meet in four hours. It is known that the speed ratio of A and B is 5: 3. How many kilometers do A and B run per hour?

480 ÷ 4 =120120 ÷ 8× 5 = 75 = a120 ? 75 = 45 = already.

3. The actual green area in Tongxian County increased by 2/5 compared with the original plan last year, and the actual green area was 150 hectares more than the original plan. How many hectares was originally planned for greening?

150÷(2/5)=375

The school choir has 45 members, the ratio of male to female is 4∶5. How many men and women are there in the school choir?

45÷9×4=20= male 45-20=25= female

5. I hope that primary schools will participate in tree planting activities and assign tasks to grades 4, 5 and 6 according to 2: 3: 4. It is known that level 6 has 84 more trees than level 4. How many trees will be planted in the third grade this time?

84÷(4-2)=? 42 ? 42×9=378

6. The number of people in the school art group belongs to the calligraphy group, and the ratio of the number of people in the art group to the number of people in the math group is 3: 5. There are 30 people in the calligraphy group and how many in the math group?

30/3×5=50 ? (This question is incomplete)

7, a cup of sugar water 200 grams, of which sugar accounts for water. If you add 8 grams of sugar, what is the ratio of sugar to water at this time?

(This question is incomplete. 0

8. There are 800 storybooks in the library, and the number of science and technology books is 65438+ storybooks 0/2 and comics 3/4. How many comic books are there? 800/2=400 400÷(3/4)≈533

19. A barrel of oil is emptied, leaving 3/5. The remaining five days are used up, with an average of 2 kilograms per day. How many kilograms is this barrel of oil?

5× 2 =10 = 3/510 ÷ 3/5 = 50/3kg.