2.24 butterflies flew away from the flowers, 16 butterflies flew away. How many butterflies have flown away twice?

There are 57 planes in the airport, 18 left. How many planes are there at the airport now?

Kobayashi planted 48 pots of safflower and the same amount of yellow flowers. How many pots of two kinds of flowers?

The school originally had 35 exercise books and bought back 45. How many are there now?

6. There are 45 apples in Xiao Qiang's family, which were eaten 17. How many?

7. There are 28 cars in the bus station, and there are 3 left. How many cars are there?

8. Children cut paper with 18 red paper and the same amount of yellow paper. How many sheets of paper did they use?

9. 49 horses in the racecourse, 15 horses. How many horses are there in the racecourse now?

10, store 85 fans, sold 18 fans. How many fans are there now?

1 1. There are 25 pots of orchids, chrysanthemums and sunflowers in the school, including 6 pots of orchids, 8 pots of chrysanthemums and several pots of sunflowers.

12, Xiaoqing drew 28 paintings twice, 9 paintings for the first time, and how many paintings for the second time?

13, Xiaohong's family has 38 apples and pears, of which 16, how many pears?

14. The school will send 89 boxes of stationery to primary school students in mountainous areas. First, 18 cases were sent, and then 24 cases were sent. How many boxes do you want to send?

15. White rabbits eat 5 cabbages every day. How much cabbage does he eat a week (7 days)?

16. There are 9 trees on both sides of a road. A * *, how many trees have been planted? (by multiplication)

17.28 cars left the parking lot, leaving 19 cars. How many cars are there in the parking lot?

18, 18 carts came from the parking lot, and the same number of cars came. How many cars have come twice?

19. There are 8 groups of football in the school gymnasium, 7 in each group. One * * *, how many?

20. In the second grade, I repaired eight chairs in the morning and tripled them in the afternoon. How many chairs have been repaired in one day?

2 1, Ming Ming calculated 8 math problems in the morning, which doubled in the afternoon. How many problems did he work out in the afternoon?

(1) How many questions did you calculate in the morning and afternoon?

(2) How many questions are there in the afternoon than in the morning?

22. There are 28 female students and 9 male students in the library. How many boys are less than girls?

There are 9 big monkeys and 58 small monkeys in the zoo. There are three times as many as big monkeys. How many little monkeys are there?

There are 47 footballs and 20 basketballs in the school. How many football is less than basketball?

25. There are 19 potted orchids and 35 potted chrysanthemums in the garden. How many pots of orchids can be planted as many as chrysanthemums?

26. Mom bought 28 red flowers, 16 blue flowers and 24 yellow flowers.

(1) How much more red flowers are there than blue flowers?

(2) How many fewer blue flowers are there than yellow flowers?

27. Xiaohua made four envelopes. The population of Xiao Liang is three times that of Xiaohua. How much did Xiao Liang do?

28. There are two bookshelves. 28 books on the first floor, and 19 books on the second floor. How many books are there on the second floor?

29. Mom bought 17 apples, and pears are 24 more than apples. How many pears did she buy?

30. There are eight hens. The number of hens is 7 times less than that of chickens. How many chickens are there?

3 1, there are 16 people going for an autumn outing in grade four, four more in grade five than in grade four, and grade six is the sum of grade four and grade five. How many people are going on an outing in grade five?

How many people went for an outing in the sixth grade?

(2) How many people are there in Grade Four, Grade Five and Grade Six?

There are 32 female students in the choir. There are fewer boys than girls 14. How many male students are there?

33. Xiaohua has 42 white sheep, and the number of black sheep is less than that of white sheep 15. How many sheep have you raised?

34. Students took part in labor and picked cucumbers 18 baskets, white melons 19 boxes and Chinese cabbage 15 boxes. * * * How many baskets did you pick?

35. Xiaoming racked the ball, 24 times for the first time, 24 times for the second time and 40 times for the third time. How many times?

Xiaoying has nine red stars, and her yellow star is five times as big as the red star. How many yellow stars?

37. The school bought 9 boxes of white chalk, each box of 5 yuan. How much is it to buy white chalk?

38. The school bought 18 boxes of white and colored chalk, including 19 boxes of colored chalk. How many boxes of white chalk did you buy back?

39. The school bought back five boxes of colored chalk. White chalk is 8 times that of colored chalk. How many boxes of colored chalk are less than white chalk?

40. The school bought back 18 boxes of colored chalk and 16 boxes of white chalk. How many boxes of chalk are there?

4 1. The school bought 4 boxes of white chalk, 7 boxes of colored chalk, each box of white chalk 5 yuan and each box of colored chalk 6 yuan. How much did it cost to buy chalk?

There are 47 orange trees and 49 persimmon trees in the orchard.

(1) How many trees are there in a * *?

(2) How many fewer orange trees are there than persimmon trees?

43. Xiaoying made 29 red flowers, 35 yellow flowers and 18 white flowers.

(1) How much more red flowers are there than yellow flowers?

(2) How much less white flowers are than red flowers?

(3) How much less white flowers are than yellow flowers?

(4) How many white flowers and yellow flowers are there?

44. The store sold 38 dolls twice and 26 dolls for the first time.

(1) How much did it sell for the second time?

(3) How many * * * have been sold twice?

There are 45 (1) white rabbits and grey rabbits ***2 1, of which white rabbits 12.

(1) the original * * * how many rabbits?

② How many gray rabbits are there?

(2) There were 50 rabbits, of which 24 escaped. How many rabbits are left?