2. Sister Obana kicks shuttlecock. Sister kicked 8 1 3 times, Xiaohua kicked 25 times for the first time and the second time. To surpass her, Xiaohua has to kick at least () times for the third time.
3. The school organizes interest groups. There are 8 people in calligraphy group and 24 people in painting group. The number of people in the singing group is twice that of the painting group, and the number of people in the singing group is () times that of the calligraphy group.
Xiaohong and Xiao Qiang buy exercise books. Xiaohong bought five books, Xiao Qiang bought three, and Xiao Qiang spent sixty cents less than Xiaohong. Each exercise book is worth 10 cent.
5. Give pencils to eight students. There are some left over from five people, and six people are not enough. There is as much left as there is not enough. A * * has () pencils.
It takes six minutes to saw a piece of wood into three sections. If the sawing time is the same every time, it will take () minutes to saw 7 segments.
7. Xiaodong has 35 pictures, Xiaoming has 43 pictures, and Xiaoming gives Xiaodong () pictures. They have as many pictures.
8. There are two ropes, and the length of the white rope is four times that of the red rope, less than 2 meters. If the white rope is18m long and the red rope is () m long.
9. Of the primary school students' mathematics newspapers subscribed by three classes in Grade Three, 58 are not from Class One, 60 are not from Class Two, and 26 are neither from Class One nor Class Two. I booked () books for three classes in Grade Three.
10. Xiaohong and Xiaolin each spent the same amount of money to buy exercise books at the same price. After buying, Xiaohong took two less copies than Xiaolin, and Xiaolin gave Xiaohong 40 cents. How much is each exercise book?
1 1.7 monkeys ate 13 peaches, each big monkey ate 3 peaches, and each little monkey ate 1 peach. Please count, there are () big monkeys.
12. Plant trees around a square site, with 10 trees on each side and one tree at each vertex. There are * * * trees around this site.
13. There are 37 students who want to cross the river by boat. There is only one empty boat that can carry five people by the river. They all have to cross the river at least () times.
14. After a game, A, B and C won the first, second and third place respectively. A said "I am the first", B said "I am the second" and C said "I am not the first". In fact, one person lied, so () is the second one.
15. The formula on the right represents the addition of two digits, and the sum is 149.
A b
+ C D
1 4 9
A+B+C+D=()
16. Xiaoming has two stamps with a face value of 30 cents and 50 cents respectively. Can he pay different postage with these stamps?
17. The department store shipped 300 pairs of sports shoes, which were packed in 2 wooden cases and 6 cartons respectively. If two cartons contain as many sports shoes as one wooden box, think about it. Each wooden box contains () pairs of shoes.
18.993+994+995+996+997+998+999=? How is it easier? Please write down the main process.