1. One child has 10 balloons, and the other child has 5 balloons. How many balloons do they have?

2. Mom gave Xiaoming 10 candy, and Xiaohong gave Xiaoming 5 candy. How many sweets does Xiaoming have now?

In a class, there are 30 students, and each student has 3 pencil boxes. How many pencil boxes are there in this class?

4. A farmer's uncle has 10 sheep, and another farmer's uncle has 5 sheep. How many sheep do they have?

5. My father gave Xiaohua 10 toy cars, and my mother gave Xiaohua five toy cars. How many toy cars does Xiaohua have now?

6. In a library, there are 20 books, each with 5 pages. How many pages are there in this library?

7. One child has 10 eraser, and the other child has 5 erasers. How many erasers do they have?

8. Mom gave Xiaoming 10 chocolate, and Xiaohong gave Xiaoming 5 chocolates. How many chocolates does Xiaoming have now?

9. In a garden, there are 30 flowers, and each flower has 3 leaves. How many leaves are there in this garden?

10, a farmer's uncle has 10 cows, and another farmer's uncle has 5 cows. How many cows do they have?

1 1. A child has 10 balloons. He sold five. How many balloons does he have left?

12, Xiao Ming has 10 candy, and he bought five more. How many sweets does he have?

13. In a school, there are 30 students, and each student has 3 books. How many books are there in this school?

14. A farmer's uncle has 10 chickens. He sold five chickens. How many chickens does he have left?

Xiaohua has 15 toy car. He gave his brother five dollars. How many toy cars does he have left?

16. In an orchard, there are 20 apples, each with 5 leaves. How many leaves are there in this orchard?

17. A child has 10 eraser. He lost five. How many erasers does he have left?

18, Xiao Ming has 10 chocolate, and he bought five more. How many chocolates does he have?

19. In a garden, there are 30 flowers, each with 3 petals. How many petals are there in this garden?

20. A farmer's uncle has 10 pigs. He sold five pigs. How many pigs does he have left?

2 1. A child drew a triangle. It is known that the lengths of the two sides are 10 cm and 5 cm respectively. What is the length of the third side?

22. Xiaoming and Xiaohua both have some coins. Xiaoming has 10 coins, and Xiaohua has 5 coins. Their total number of coins is 15. So how many coins do they have on average?

23. In a classroom, there are 30 students, each sitting in a seat. How many seats are there in this classroom?

24. A farmer's uncle has 10 ducks. He sold five. How many ducks does he have left?

25. Xiaoming and Xiaohua play jigsaw puzzles together. Xiaoming completed 10 puzzles and Xiaohua completed 5 puzzles. How many puzzles have they completed?

26. In a lake, there are 20 boats. Each boat can hold four people. How many people can this lake hold at most?

27. A child has 10 oranges. He ate two. How many oranges does he have left?

28. Xiaoming has a 10 toy train, and he bought two more. How many toy trains does he have?

29. In a playground, there are 30 children playing. Every child needs a ball. How many balls are there in this playground?

30. A farmer's uncle has 10 goats. He gave two to his friends. How many goats does he have left?

3 1, Xiaoming went fishing in Obana, Xiaohua caught 10 fish, Xiaoming caught 5 fish, how many fish did they catch?

32. Mom gave Xiaoming 10 a puzzle. Xiaoming has put together two puzzles. How many puzzles does he have left?

33. In the library, there are 30 books, each with 30 pages. How many pages are there in this library?

34. A child has 10 paper planes. He has folded five new paper planes. How many paper planes does he have now?

Xiaoming and Xiaohua play hide-and-seek together. Xiaoming found 10 people, and Xiaohua found 5 people. How many people did they find?

36. In a swimming pool, there are 20 swimming rings, each of which can be inflated five times. How many times does this swimming pool need to be inflated?

37. A child has 10 plasticine balls. He made ducklings out of five of them. How many plasticine balls does he have left?

38. Xiaoming has 10 markers. He bought two new markers. How many colored pens does he have?

39. On a playground, there are 30 children playing with sand. Every child needs a small shovel. How many shovels are there in this playground?

40. A farmer's uncle has 10 rabbits. He gave his neighbor two rabbits. How many rabbits does he have left?

4 1, Obana Xiaoming went to the orchard to pick apples, Xiaohua picked 10 apples, and Xiaoming picked 5 apples. How many apples did they pick?

42. Xiaoming has 10 Lego bricks. He gave his brother five Lego bricks. How many Legos does he have left?

43. In a park, there are 30 kites, and each kite has three tails. How many tails are there in this park?

44. Xiaoming from Oubana went to an art exhibition to see paintings. Xiaohua saw 10 painting, and Xiaoming saw 5 paintings. How many pictures did they see?

45. On a farm, there are 30 cows, and each cow can drink 3 barrels of water every day. How many barrels of water does this farm prepare every day?

46. Xiaohua has 10 teddy bears. He gave his sister five dollars. How many teddy bears does he have left?

47. In a swimming pool, there are 20 lifebuoys, each of which can be inflated twice. How many times does this swimming pool need to be inflated?

48. Xiaoming has a 10 dinosaur model, and he bought two new ones. How many dinosaur models does he have?

49. On a playground, there are 30 children playing football. Every child needs a ball. How many balls are there in this playground?

50. A farmer's uncle has 10 chickens. He gave his neighbor three chickens. How many chickens does he have left?

5 1, Obana Xiaoming went fishing, Xiaohua caught 10 fish, Xiaoming caught 5 fish, how many fish did they catch?

52. Xiaoming has 10 Lego bricks, and he bought five new ones. How many Lego bricks does he have?

53. In a garden, there are 30 flowers, each with 3 petals. How many petals are there in this garden?

54. Xiaoming went skating in Obana, Xiaohua skated 10, and Xiaoming skated 5 times. How many laps did they skate?

55. In a pool, there are 20 balloons, and each balloon can be blown three times. How many times can this pool be blown?

56. Xiaoming has a 10 toy car. He gave his friend five dollars. How many toy cars does he have left?

57. In the library, there are 30 books, each with 30 pages. How many pages are there in this library?

58. Xiaohua has 10 plasticine balls. He made a duckling out of five of them. How many plasticine balls does he have left?

59. Xiaoming and Xiaohua go to buy candy together. Xiaoming bought 10 candy, and Xiaohua bought 5 candy. How many sweets did they buy?

60. A farmer's uncle has 10 goats. He gave his friend two goats. How many goats does he have left?

6 1, Obana Xiaoming went to the zoo to see animals. Xiaohua saw 10 kinds of animals. Xiaoming saw 5 kinds of animals. How many kinds of animals did they see?

62. Mom gave Xiaoming 10 chocolate cake, and Xiaoming ate two more. How many chocolate cakes does he have left?

63. In an orchard, there are 30 fruit trees, and each tree can bear three fruits. How much fruit can this orchard bear?

64. Xiaoming from Oubana went to an art exhibition to see paintings. Xiaohua saw 10 painting, and Xiaoming saw 5 paintings. How many pictures did they see?

65. An amusement park with 30 amusement projects requires 1 ticket for each project. How many tickets does this amusement park need?

66. Xiaohua has a 10 toy car. He gave his brother five dollars. How many toy cars does he have left?

67. In a swimming pool, there are 20 swimming rings, each of which can be inflated five times. How many times does this swimming pool need to be inflated?

68. Xiaoming has a 10 dinosaur model, and he bought two new ones. How many dinosaur models does he have?

69. On a playground, there are 30 children playing football. Every child needs a ball. How many balls are there in this playground?

70. A farmer's uncle has 10 rabbits. He gave his neighbor three rabbits. How many rabbits does he have left?

7 1. Xiao Ming from Albana went shopping in the mall. Xiaohua bought 10, and Xiaoming bought 5. How many things did they buy?

72. Dad gave Xiaoming 10 Lego toys, and Xiaoming bought two Lego toys. How many Legos does he have?

73. In a garden, there are 30 flowers, each with 3 petals. How many petals do these flowers have?

74. Xiaoming from Oubana went to the park to play, Xiaohua played 10 amusement project, and Xiaoming played five amusement projects. How many amusement projects did they play?

On a farm, there are 30 cows. Each cow needs to eat 3 kilograms of feed every day. How many kilograms of feed does this farm need to prepare every day?

76. Xiaohua has 10 balloons. He released five balloons. How many balloons does he have left?

77. In a swimming pool, there are 20 lifebuoys, each of which can be inflated twice. How many times does this swimming pool need to be inflated?

78. Xiaoming has a 10 toy car. He bought two new toy cars. How many toy cars does he have?

79. On a playground, there are 30 children playing football. Every child needs a ball. How many balls are there in this playground?

80. A farmer's uncle has 10 chickens. He gave his neighbor two chickens. How many chickens does he have left?

8 1, Obana Xiaoming went to the bookstore to buy books, Xiaohua bought 10 books, and Xiaoming bought 5 books. How many books did they buy?

82. Dad gave Xiaoming 10 chocolate cake, and Xiaoming ate two more. How many chocolate cakes does he have left?

83. In an orchard, there are 30 fruit trees, and each tree can bear three fruits. How many fruits can these fruit trees bear?

84. Xiaoming from Obana visited the Natural History Museum. Xiaohua saw 10 exhibits, and Xiaoming saw 5 exhibits. How many exhibits did they see?

85. An amusement park with 30 amusement events requires 1 ticket for each event. How many tickets does this amusement park need?

86. Xiaohua has 10 toy planes. He gave his brother five toy planes. How many toy planes does he have left?

87. In a swimming pool, there are 20 swimming rings, each of which can be inflated five times. How many times does this swimming pool need to be inflated?

88. Xiaoming has a 10 dinosaur model. He bought two new ones. How many dinosaur models does he have?

89. On a playground, there are 30 children playing football. Every child needs a ball. How many balls are there in this playground?

90. A farmer's uncle has 10 rabbits. He gave his neighbor three rabbits. How many rabbits does he have left?

9 1, Obana Xiaoming went to the toy store to buy toys, Xiaohua bought 10 toys, and Xiaoming bought five toys. How many toys did they buy?

92. Mom gave Xiaoming 10 candy, and Xiaoming ate two more. How much sugar does he have left?

93. In a garden, there are 30 flowers, each with 3 petals. How many petals are there?

94. Xiaoming from Obana visited the museum. Xiaohua saw 10 exhibits, and Xiaoming saw 5 exhibits. How many exhibits did they see?

95. An amusement park with 30 amusement events requires/kloc-0 amusement tickets for each event. How many amusement tickets does this amusement park need?

96. Xiaohua has 10 balloons. He released five balloons. How many balloons does he have left?

97. In a swimming pool, there are 20 swimming rings, each of which can be inflated twice. How many times does this swimming pool need to be inflated?

98. Xiaoming has 10 toy cars. He bought two new toy cars. How many toy cars does he have?

99. On a playground, there are 30 children playing football. Every child needs a ball. How many balls are there in this playground?

100. A farmer's uncle has 10 goats. He gave his friend two goats. How many goats does he have left?

Matters needing attention in training:

1, determine the training goal: define the purpose and goal of training, whether to improve the speed of solving problems or improve the correct rate. In training, we should pay attention to different training methods and strategies corresponding to different goals.

2. Make a training plan: Make a reasonable training plan according to the training objectives and your own actual situation. Including the time, intensity and content of training, as well as how to arrange rest and adjust the training state.

3. Choose appropriate training materials: Choose training questions that are consistent with the test questions and difficulty, and you can choose related books and websites. At the same time, we should pay attention to selecting high-quality training materials to avoid invalid training.

4. Pay attention to the mastery of basic knowledge: before doing problem training, make sure that you have mastered the relevant basic concepts and problem-solving methods. This can avoid wasting time and energy because the basic knowledge is not solid in training.

5. Accumulate problem-solving experience: Accumulate problem-solving experience through a lot of practice. For topics that often make mistakes, we should carefully analyze the reasons for the mistakes and record them to avoid making mistakes again.