Answers to the eighth issue of the third grade mathematics knowledge report in primary school

1. The engineering team built a canal with a length of 3,300 meters, which has been built for 25 days, with 425 meters left to be repaired. How many meters are repaired on average every day?

2. Two ships, Party A and Party B, leave the dock in opposite directions at the same time. The speed of ship A is 23.5 kilometers per hour, and that of ship B is 2 1.5 kilometers per hour. After several hours of sailing, the two ships are 360 kilometers apart.

Light light blue and Tahina Eva are good friends holding hands. They spend 262.4 yuan on school supplies every year, and the cost of light light blue is 5.4 times that of Tahina. How much do light light blue and Tahina Eva spend on school supplies every year?

The highway between the two cities is 4 18km long. Two cars, A and B, started from two cities at the same time, walked in opposite directions, and met after 5.5 hours. The speed of car A is 36 kilometers per hour, and how many kilometers per hour is car B?

There are 2 16 domestic cars in the parking lot, which is twice as few as 58 foreign cars. How many foreign-made cars are there?

6. There are some hens in the chicken farm, including 26 flying hens, which lay an average of 364 eggs every year, and 25 oily chickens, which lay an average of 330 eggs every year. How many eggs do these hens lay every year? (Numbers are reserved as integers)

7. Two cars start from two places at the same time and drive in opposite directions. 4.5 hours later, the two cars met at a distance of 9 kilometers from the midpoint. The express train runs 42 kilometers per hour. What is the distance between a and b?

8. A clothing factory has 1.200m cloth. Make 1 50 sets of adult clothes first. Every 5 meters of cloth, the rest is for children's wear. How many sets of children's clothes can be made per 3m cloth? (Equation solving)

9. The road construction team will repair the road, and the construction is planned to be completed every day150m, 12 days. If it is to be completed two days in advance, how many meters will be built every day? (Solving by Arithmetic and Equation)

10. Xiao Li bought 10 pencils and 8 exercise books and paid 29.64 yuan. It is known that each pencil 1.3 yuan. How much is each exercise book? (Solving by Arithmetic and Equation)

1 1. In the first quarter, the school bought 50 Lenovo computers and spent 340,000 yuan. In the second quarter, it bought 45 Founder computers, each cheaper than Lenovo computers by 800 yuan. How much did it cost to buy Founder Computer?

12. The dosage of a drug is: 0.06 grams per kilogram of body weight of adults, which is 2.5 times that of children. If a child in a kindergarten class weighs 20 kilograms, how many grams can he eat at a time?

13. The average score of Chinese and mathematics in Xiaoming's mid-term exam is 89.5. If his English scores are included, his average score can be improved by 1.5. What's Xiao Ming's English score?

14. Dance room length 15m, width 8m. The floor with wooden floor is 1.5 m long and 9 cm wide. How many wooden floors should there be at least?

15. Master and apprentice processed 532 parts, but after 2 .5 hours of processing, 232 parts were not processed. The apprentice processes 57 parts per hour. How many parts does the master process per hour?

16. Two barrels of oil * * * weigh 8kg. It is known that the oil in barrel A is twice as much as that in barrel B, less than 1kg. How much do these two barrels of oil weigh? (Equation solving)

17.40 The sailor set sail with fresh water for 20 days, and expected to reach the destination on 16. Five days later, 10 foreign sailors were rescued on the high seas. According to this calculation, is there enough fresh water left? Why? (Available calculation instructions)

18. Mao Mao's family and Dongdong's family used to have 50 tropical fish, and Mao Mao's family gave Dongdong's family 7 tropical fish, with as many as the two tropical fish. How many tropical fish are there in the two families?

19 Suning Appliance City sold some microwave ovens, and sold more than half of them in the morning, leaving 10. How many microwave ovens were there in Suning Appliance City?

20. Grade five students compete to make kites. The grade of Class One is three times that of Class Two, while Class Three is three times that of Class Two.

Four times. It is understood that Class Three made 24 kites. How much did Class One do?

1.(3300-425)/25 = 1 15 (m)

2.360/(23.5+2 1.5)=8 (hours)

3. Lany: 262.4/( 1+5.4)=4 1 (yuan) light blue: 4 1*5.4=22 1.4 (yuan).

4.418/5.5-36 = 40km

5.(2 16+58)/2= 137 (vehicle)

6.(26*364+25*330)/(26+25)=347 (pieces)

7.(4.5*42-9)*2=360 km

8. Solution: Let's make X sets of children's clothes.

150*5+3x= 1200

3x=450

x= 150