1. There are 98 story books in the library. Today, 46 books were lent out and 25 books were returned. How many story books are there in the library now? Answer: 98-(46-25)=77.
2. A children's coat is 48.5 yuan, a pair of trousers is cheaper than a coat in 9.8 yuan, and a skirt is more expensive than trousers in 2.5 yuan. How much is this skirt? Answer: 48.5-9.8+2.5=4 1.2 yuan.
Dad took Xiaoming skiing. It took him four minutes to climb the mountain by cable car, which travels 200 meters per minute. It took 20 minutes to ski downhill, walking 70 meters per minute. How many meters is skiing more than taking a cable car? Answer: 20×70-4×200=600 km.
4. The length of the highway from a county to the provincial capital is160km. The speed of the car is 80 km/h on the expressway and 40 km/h on the ordinary highway. How much time does it save to take the expressway from the county seat to the provincial capital than the ordinary highway? Answer: 160÷40-80÷40=2 hours
5. Datong Township Central Primary School planted trees on barren hills. In 2002, it planted 356 trees. In 2003, trees were planted three times, each time 140 plants. In what year were many trees planted? How much more? Answer: 140×3=420 trees 420-356=64 trees in 2003.
6. Uncle Li keeps 42 chickens at home, and the number of ducks is only half of that of chickens. How many chickens and ducks are there in Uncle Li's house? Answer: 42+42÷2=63
7. There are two layers of books on the bookshelf, *** 144. If you take eight books from the lower floor and put them on the upper floor, the number of books on the two floors is the same. How many books are there on the shelf and the lower shelf? Answer: upper layer:144 ÷ 2-8 = 64; Lower level: 64+8+8=80.
8. The school shipped 850 Jin of rice, three cars, and the remaining 100 Jin. How many kilograms does each car transport on average? Answer: (850- 100) ÷ 3 = 250kg.
9. Miss Wang has to correct 48 compositions, which have been corrected 12. If you grade 9 articles per hour, how many hours will it take to complete? Answer: (48- 12)÷9=4 hours.
10. An elephant in the zoo eats 180 kilograms of food every day, and a panda eats 72 kilograms of food every two days. How many times do elephants eat more food than pandas every day? Answer: 180÷(72÷2)=5.
1 1. The fruit shop sent 8 boxes of apples and 8 boxes of bananas. Apples are 25kg per box and bananas are18kg per box. How many kilograms of fruit did a * * * send? Answer: 8×(25+ 18)=344 kg.
12, Xiaolin's height is 124 cm, which is twice that of his cousin, while his uncle's height is three times that of his cousin. How many centimeters is uncle tall? Answer: 124÷2×3= 186cm.
13, the school organized tree planting, and there were 25 groups with 5 trees in each group. Bought Miao Hua 1250. How much is each seedling? Answer: 1250÷(25×5)= 10 yuan.
14, Xiaoli's family buys a box of milk and a bag of soybean milk every day. Milk costs 2.40 yuan per bag, which is more expensive than soybean milk 1.80 yuan. How much does it cost for Xiaoli's family to buy milk and soybean milk a week? Answer: (2.4-1.8+2.4) × 7 = 21yuan.
Zhang Ying, Li Qiang and Hong Xiao took part in the high jump. Zhang Ying jumped 1. 1 m, which was 0.15m lower than Li Qiang. Hong Xiao jumps 0.09 meters lower than Li Qiang. How high did Hong Xiao jump? Answer:1.1+(0.15-0.09) =1.16m.
16, and the surface area of the earth is 5 10/00000 square kilometers, of which the land area is1490000 square kilometers. How many billion square kilometers is the ocean area larger than the land area? Answer: 5.1-1.49-1.49 = 2.12km2.
17, the students planted trees along the path, with a total length of 100 meters, and planted one tree every 5 meters (both ends should be planted). How many seedlings does a * * * need? Answer:100 ÷ 5+1= 21.
18. Garden workers planted trees along the road, planting one tree every 6 meters, and planting 36 trees in a row. How far is it from 1 tree to the last one? Answer: (36-1) × 6 = 210m.
19, a piece of wood is 10 meter long, and it is divided into five sections on average. It takes 8 minutes to saw the next paragraph, and how many minutes does it take to see a * * *? Answer: 5- 1=4, 4×8=32 points.
20. There is a square flower bed in front of the school building. There are 8 pots of flowers on each side of the outermost layer of this flower bed. How many pots of flowers are put on the outermost layer? Answer: (8- 1)×4=28 pots.
2 1. Woodpeckers can eat 45 15 pests in 7 days, and tits can eat 1 155 pests in a week. How many pests do woodpeckers eat on average every day than tits? Answer: 4515 ÷ 7-1155 ÷ 7 = 480.
22. The length of a rectangle is 0.54 meters, which is 8 centimeters more than its width. What is the circumference of this rectangle? Answer: 8cm = 0.08m (0.54+0.54-0.08) × 2 = 2m.
23. A football is 48.30 yuan and a basketball is 54.20 yuan. Miss Wang spent 65,438+050 yuan on a football and a basketball. How much should she get back? Answer: 150-(48.3+54.2)=47.5 yuan.
A chair costs 35.4 yuan, which is cheaper than a table 16.2 yuan. How much did Xiao Ming spend on a desk and chair? Answer: 35.4+ 16.2+35.4=87 yuan.
25. A park has 180 visitors in the morning and 270 in the afternoon. If every 30 tourists need a cleaner, how many more cleaners will be sent in the afternoon than in the morning? Answer: 270÷30- 180÷30=3.