(2) Xiaoming keeps 20 goldfish, 4 Xiaoli and 5 Xiaodong. How many goldfish does Xiaoming have?
(3) The stationery store originally had 42 packs of exercise books and sent 39 packs. These exercise books are packed in 9 cartons on average. How many packages are packed in each carton?
(4) The worker's uncle wants to build a road with a length of 100 meters, which has been built for 64 meters, and the remaining 6 days will be completed. How many meters are repaired on average every day?
(5) Xiaoming planted poplars 14 and willows 12. The number of pine trees planted is 3 less than the total number of poplars and willows. How many pine trees have been planted?
(6) The store bought 56 washing machines, and sold 14 on the first day and 2 1 on the second day. How much is left? (in two ways)
(7) A football 9 yuan. The school bought six footballs and paid 100 yuan. How much should I get back?
(8) Application problem of the second volume of mathematics in the first grade of primary school: a science and technology book is 8 1 page, and Xiaoming has read 25 pages, and the rest read 8 pages on average every day. How many days will it take to complete?
(9) There are 789 students in Hongxing Primary School, more than Guanghua Primary School 189. How many students are there in Guanghua Primary School?
(10) Tamura produced 8,757 kilograms of pears last year, of which 3,879 kilograms were sent to the factory to make jam and the rest were sold in the market. How many kilograms are there?
Trees were planted (1 1) on Arbor Day. The fifth grade girls planted 38 trees, while the boys planted 57 trees. The sixth-grade students planted 25 more trees than the fifth-grade students. How many trees were planted in the sixth grade?
(12) There are 3,249 hens in the chicken farm, 2,483 fewer than chickens. How many chickens are there? How many chickens are there in the chicken farm?
(13) There are 27 books on the shelf, and there are 20 books on it, and there are () books on the shelf.
(14) There are 7 white ducks in the river, 8 white ducks and 6 black ducks on the shore, * * * with () white ducks and * * with () ducks.
(15) There are 8 pears, 6 apples are more than pears, and there are () apples.
(16) There are 430 big cows, less than calves 100, and calves have ().
(17) Xiaohong arrives at school at 7: 30 in the morning, finishes school at 1 1: 30 in the afternoon, and finishes school at 3: 30 in the afternoon. Xiaohong stays at school for () hours every day.
(18) Wang Li weighs 54 kilograms, which is 4 kilograms heavier than Li Ming who weighs () kilograms.
(19) One stroller has three wheels, and four such strollers have () wheels.
(20) There are three children singing. Each child sings two songs, and one sings ().
Math application problem 2 1. There are 25 books in the book corner of Class Two, Grade One. The students donated 9 story books and 8 picture books. There are books () in the corner now.
2. Coat: 50 yuan pants: 30 yuan shoes: 19 yuan.
(1) Buy a pair of pants and shoes * * * () Money.
(2) Xiaohua wants to buy a coat, a pair of trousers and a pair of shoes, 100 yuan. Is that enough?
It takes 30 girls and 25 boys to rehearse the dance. How many students do I need?
4.( 1) There are 8 people playing table tennis and 36 people doing exercises in the activity class. How many students are playing table tennis and doing exercises?
(2) In the activity class, 26 students participated in sports activities and 40 students participated in literary and artistic activities. How many people participated in these two activities?
There are 46 students and 20 boys in our class. How many girls are there?
6.( 1) There are 48 seats on a bus, and there are 7 seats left after passengers get on the bus. How many passengers are there on board?
(2) A bus has 48 seats and 30 passengers get on. How many seats are left?
7.( 1) A book has 42 pages, and Xiaohua has read 7 pages. How many pages are left to read?
(2) A book has 42 pages, Xiaohua has read some, and 30 pages have not been read. How many pages did Xiaohua read?
8.( 1) There are 84 comic books in the library, and 9 of them have been lent out. How many books are left?
(2) There are 84 comic books in the library, 9 of which are borrowed from Class One and 8 from Class Two. How many books are left?
9. Schoolbag: 49 yuan watercolor pen: 10 yuan Ink: 3 yuan
(1) How much is the schoolbag more expensive than the marker?
(2) How much is ink cheaper than watercolor pens?
(3) What other questions can you ask?
10. Mother Rabbit: I collected 35 radishes. Rabbit: I have 30 radishes.
(1) How many more radishes did the mother rabbit receive than the baby rabbit?
(2) How many radishes does the rabbit take less than the mother rabbit?
1 1. Hen: 35 chicks: 50 chicks.
(1) How many chickens are there than hens?
(2) How many hens are fewer than chickens?
12. Bus: 30 CMB: 45 car: 40 car.
(1) How many cars are there than buses?
(2) How many buses are there in China?
(3) What other questions can you ask?
13. Take 50 yuan to buy tickets and give me 20 yuan. How much did this ticket cost?
14. In the skipping competition, Xiaoming jumped 20 times, Xiaodong 30 times and Xiaoli 46 times.
(1) How many times does Xiaoming jump less than Xiaodong?
(2) How many times does Xiao Li jump than Xiao Dong?
(3) What other questions can you ask?
15. The students planted trees, including 20 trees in Class One, 35 trees in Class Two and 40 trees in Class Three.
(1) How many more trees have been planted in Class Two than in Class One?
(2) How many trees have been planted in Class One than in Class Three?
(3) How many trees are planted in three classes?
16. How many waste plastic bottles did Xiaohua collect?
Xiao Gang: I collected 50 waste plastic bottles.
Xiaohua: I'll take nine more, as much as you.
17. Swimming: 25 people running: 30 people long jump: 20 people
(1) How many more students take part in swimming than in running?
(2) How many runners are there than long jumpers?
(3) What other questions can you ask?
18. Dad: I'm 32 years old. Son: I am 8 years old.
/kloc-how old is the father after 0/0 years?
19. Shopping.
Ben: 1 Yuan watercolor pen: 13 yuan pen: 1 Yuan angle alarm clock: 29 yuan.
(1) How much does it cost to buy a box of watercolor pens and an alarm clock?
(2) Xiaohong bought a pencil box and paid 5 yuan money. The salesman got back 1 50 yuan. How much is a pencil box?
(3) How can I pay for a pen?
(4) How much is a pen more expensive than a book?
(5) What two things can Xiao Ming buy with 20 yuan money? How much is left?
(6) What other math questions can you ask? Write it out and answer it.
20.A * * * has 15 apples, there are eight outside, and how many are there in the basket?
Question 1: Explain the origin of the number "zero"; (1) explained the meaning of "zero" and (1) verified the difficulty of "zero