First kind

(300+6)x 12 25x(4+8) 125 x(35+8)( 13+24)x8

The second type

84x 10 1 504 x25 78x 102 25x 204

The third kind

99x64 99x 16 638x99 999x99

The fourth kind

99x 13+ 13 25+ 199 x25 32x 16+ 14x 32 78 x4+78x 3+78x 3

The fifth kind

125 x32x 8 25 x32x 125 88x 125 72x 125

The sixth kind

3600÷25÷4 8 100÷4÷75 3000÷ 125÷8 1250÷25÷5

The seventh kind

1200-624-76 2 100-728-772 273-73-27 847-527-273

The eighth kind

278+463+22+37 732+580+268 1034+780320+ 102 425+ 14+ 186

The ninth kind

2 14-(86+ 14) 787-(87-29) 365-(65+ 1 18) 455-( 155+230)

The tenth kind

576-285+85 825-657+57 690- 177+77 755-287+87

Eleventh kind

87 1-299 157-99 363- 199 968-599

The twelfth kind

178 x 10 1- 178 83x 102-83x 2 17X23-23x 7 35x 127-35x 16- 1 1x 35

Thirteenth kind

64(8 x2) 1000( 125 x4)

Fourteenth kind

375 times (109-9)456 times (99+ 1)

126×6×8 55×36+64×55

755- 122-78 789×99

(8+80)× 125 25× 10 1

125×38+ 125×30 ( 125+ 16)×8

78 1× 10 1-78 1 25× 16-25× 10

25× 16× 125 25×32

234×80×5 78 1-499

79× 16+79×78+79×6 79×99+79

800÷ 125 4004×25

2000÷ 125 65+93×65+6×65

9999+999+99+9 158+262+ 138

600÷25÷4 (2 130+783+270)+ 10 17

600÷25 125× 18

375+2 19+38 1+225 500 1-247- 102 1-232

(375+ 1034)+(966+ 125) 99+999+9999+99999

3999+498 1883-398

2356-( 1356-72 1) 75×27+ 19×25

3 1×870+ 13×3 10 4×(25×65+25×28)

Error-prone types (* * * five types)

600-60÷ 15 736-35×20 25×4÷25×4

98- 18×5+25 56×8÷56×8 280-80÷ 4

175-75÷25 80-20×2+60 36×9÷36×9

36-36÷6-6 25×8÷(25×8) 100+45- 100+45

48×99+ 1 1000+8- 1000+8 5+95×28

102+ 1- 102+ 1 65+35× 13 25+75-25+75

672-36+64 324-68+32 13+24×8

100-36+64 100+ 1- 100+ 1 40+360÷20- 10

Section 4 Multiple Problems

Basic formula: sum of two numbers ÷ (multiple+1)= decimal decimal × multiple = large number or: sum of two numbers-decimal = large number.

1. There are 2332 story books and history books in the library. History books are three times as many as story books. How many story books and history books are there?

2. There are 1245 fruit trees in the orchard. Apple trees are twice as big as peach trees and pear trees are twice as big as apple trees. How many fruit trees are there?

The school bought a printer and a copier for 9840 yuan. The price of a copier is twice that of a printer, which is less 120 yuan. What are the prices of printers and copiers?

4. Apple banana * * * 1502kg is delivered from the fruit shop. If apples are reduced by 50 kilograms and bananas are increased by 350 kilograms, bananas are 2 kilograms heavier than apples. How many kilograms are apples and bananas?

5. There are 65,438+002 workers fertilizing and 65,438+046 workers weeding in the orchard. How many workers should be transferred to weed, so that the number of weeding people is three times that of fertilizing people?

6. Three road repair teams * * * road repair 2120m. Team A built twice as many roads as team B, and team B built 360 meters more roads than team C. How many meters did the third team build?

7. It is known that the sum of two numbers is 8 14, and the single digit of one number is 0. If you remove the single digit of this number and it is equal to another number, you will find these two numbers.

8. Sister and Sister made 340 little red flowers. Later, my sister gave Xiaoming 30 red flowers she made, and my sister made 20 more. At this time, my sister made five times as many small red flowers as her sister. How many red flowers did my sister make?

9. A wire is 240 meters long. Cut it into three sections, so that the first section is 20 meters longer than the second section and the third section is twice as long as the first section. How long are these three wires?

10, A, B and C. The number of cars in parking lot A is twice that in parking lot B, and the number of cars in parking lot C is 1. It is known that there are 12 1 cars in parking lots A, B and C, so we can find three parking lots: A parking lot, B parking lot and C parking lot.

No.1 Radio Factory 1 1 produced three types of radios * * * 156 last month, of which Type A is twice as much as Type B, 15, Type B is twice as much as Type E, and 2 1. Last month, we produced type A, type B and type E..

12, Xiaohua is 57 years younger than grandpa, and grandpa is 6 times younger than Xiaohua and 3 years younger. How old is Grandpa Kobanawa?

13. If the fish tail weighs 4 kilograms, the weight of the fish head is equal to the weight of the fish tail plus half of the fish body, and the weight of the fish body is equal to the weight of the fish head plus the fish tail, how many kilograms does this fish weigh?

14, Wang Liang scored an average of 94 points in Chinese and math in the mid-term exam, but he didn't do well in math, and Chinese scored 8 points more than math. How many points did Wang Liang get in Chinese and Mathematics?

15, the sum of the four numbers A, B, C and D is 45. If A adds 2, B subtracts 2, C multiplies 2 and D divides 2, four numbers are exactly equal. What are these four numbers?

16, father 47 years old, Xu Hong1/kloc-0 years old. How many years ago, my father was five times as old as Hong Xu?

17. Add the minuend, the minuend and the difference to a subtraction formula, and the number is 592. It is known that the subtraction ratio difference is 2 times larger. What is subtraction?

18, the average age of Party A, Party B and Party C is 42 years old. If Party A's age increases by 7 years, Party A's age doubles and Party C's age decreases by 2 times, then the three people are equal. How old is Party C?

19, A minus 878 equals B; If the number A plus 1 142 equals five times the number B, what are the numbers A and B respectively?

20. A middle school used the summer vacation for military training, with a daily journey of 35km in sunny days and 22km in rainy days, 13 days and 403km. How many rainy days are there during this period?

2 1, warehouses a and b have 80 tons of rice. If 15 tons of rice is transferred from warehouse a to warehouse b, the rice in the two warehouses is exactly equal. How many tons of rice are there in these two warehouses?

22. Xiaohong scored an average of 95 points in Chinese and mathematics in the final exam, and mathematics scored 8 points more than Chinese. How did Xiaohong do in these two courses?

23. Two baskets of fruit weigh 50 kilograms. If you take out 5 kilograms from the first basket and put it in the second basket, then the first basket is 4 kilograms more than the second basket. How many kilograms are there in each of the two baskets of original fruit?

Section 6: Differential Time Exercise [Answer]

1. Football is three times that of volleyball, and football is more than volleyball 18. How many football and volleyball are there? [9/27]

A basket of apples is 40 kilograms heavier than a basket of oranges, and the weight of apples is five times that of oranges. How many kilograms are apples and oranges? [ 10/50]

3. Two wheat experimental fields, the second one is 8 mu less than the first one, and the area of the first one is 3 times that of the second one. How many acres are there in each of the two experimental fields? [4/ 12]

4. The sum of the differences between number A and number B is equal to 6, so what is the sum of number A and number B? [8.4]

5. The number of people participating in the science and technology group this year is 4 1 more than last year, and the number of people this year is 35 times less than last year. How many people participated this year? [38/79]

6. Xiaoming is 9 years old and his father is 39 years old. How many teenage fathers are exactly twice the age of Xiao Ming? [2 1]

7. My uncle is older than Zhang Da 19, which is exactly three times that of Zhang Qiang. 1 year. How old are my uncle and Zhang Qiang? [9/28]

There is a flock of sheep on the hillside, including sheep and goats. There are 55 known sheep three times more than goats, and 345 known sheep are more than goats. How many sheep are there in each species? [ 145/490]

9. Yucai Primary School has 45 times fewer people participating in the science and technology group than the choir, and more people participating in the science and technology group than the choir 105. What is the number of students participating in the science and technology group and chorus? [50/ 155]

10. Really do an addition problem. When calculating, the result is 702 less than the correct answer. What is addend? [780]

1 1. It is known that the difference between the two numbers is 5.49. Moving the decimal point of a larger number to the left is equal to a smaller number. What's the bigger number? What's the smaller number? [6. 1/0.6 1]

12. It is known that the quotient of two numbers is 4, and the difference between these two numbers is 39, so what is the smaller number of these two numbers? [ 13]

13. Tripartite fish A, B and C. Party A catches 6 more fish than Party B, and Party C catches 2 more fish than Party A and 22 more fish than Party B. How many fish do they catch each? [58]

14. One day, members of three fishing associations, A, B and C, went fishing in the suburbs. As we all know, A caught 6 more fish than B, C caught 2 times more than A and 22 more than B. How many fish did they catch? [58]

15. Three children make paper flowers, Xiaolin makes 12 more flowers than Xiaoming, Xiaoyun makes 8 fewer flowers than Xiaoming, and Xiaolin makes 3 times as many flowers as Xiaoyun. How many flowers does each of them make? [ 10/ 18/30]

16. In a workshop, there are 35 fewer female workers than male workers. 17 after the male and female employees were transferred out separately, the number of male employees was twice that of female employees. How many men and women are there? [52/87]

17. The number of male workers in the workshop is twice that of female workers. If 18 male employees are transferred, female employees are twice as many as male employees. How many women workers are there in this workshop? [ 12]

18. The number of rice bags in warehouse A is four times that in warehouse B, and 1 150 bags are shipped from warehouse A. After 250 bags are shipped from warehouse B, the remaining quantity in the two warehouses is the same. How many bags of rice are there in warehouses A and B? [300/ 1200]

19. warehouse a stores 500 bags of rice and warehouse b stores 200 bags of rice. Now the same amount of rice is shipped from two warehouses. As a result, the rice left in warehouse A is exactly three times as much as that in warehouse B. How many bags of rice did each warehouse transport? [50]

20. After two baskets of apples with the same weight are sold in basket A, 7 kg in basket B and 65,438+09 kg in basket B, the remaining kg in basket A is three times that in basket B. How many kg is there in each basket? [25]

The wine in 2 1.A barrel is four times as much as that in B. If 15 kg is taken out of A barrel and poured into B barrel, the weight of the two barrels is equal. How many kilograms of wine were there in these two barrels? [ 10/40]

22. There are two baskets of apples. If you take out nine apples from the first basket and put them in the second basket, the number of apples in the two baskets is equal; If you take 12 apples from the second basket and put them in the first basket, the number of apples in the first basket is equal to twice that in the second basket. How many apples are there in each basket? [54/72]

23. Two piles of coal, A 94 tons, B 138 tons, transported 9 tons every day. A few days later, there was three times as much coal left in a pile. [8]

24. There are as many apples in the two baskets A and B. A sold 7 kilograms. After B sold 19 kilograms, the number of kilograms left in the basket A was three times that of B. How many kilograms are there in the two baskets? [25]

25. White chalk is seven times as big as colored chalk. If you buy 12 boxes of colored chalk and white chalk, the number of boxes of white chalk is three times that of colored chalk. How many boxes of these two kinds of chalk are there? [6/42]

26. The number of extracurricular books in Xiaofang is three times that in Xiao Qiang. If Xiaofang lends Xiao Qiang 10 books, Xiao Qiang's books are three times as many as Xiaofang's. How many extracurricular books are there in Xiao Fang and Xiao Qiang? [5/ 15]

27. My brother and my sister have equal deposits. My brother saved 200 yuan, and after my sister took out 50 yuan, my brother's deposit was three times that of my sister. How much money does each of them have? [ 175]

28. The master and the apprentice made a batch of parts, and the number made by the master three days ago was four times that of the apprentice. If the master and the apprentice each earn 18, the apprentice earns half of the master. How much did the master and the apprentice do three days ago? [9/36]

29. There are two baskets of apples. If you take nine apples from the first basket and put them in the second basket, the number of the two baskets is equal. If you take out 12 from the second basket and put it in the first basket, the number of the first basket is twice that of the second basket. How many apples are there in each basket? [72/54]

30. A team member went to the nursing home with a basket of apples and pears. Every time, he takes out two pears and five apples from the basket for the old man. Finally, there are 1 1 apples left, and the pears have just been eaten. Only then did they realize that there were three times as many apples as pears. How many old people are there in the nursing home? [ 1 1]

3 1. There used to be 480 people taking part in outdoor activities in Yuhong Primary School. Now 50 people who participate in indoor activities are changed to outdoor activities, so the number of people who participate in outdoor activities is exactly five times that of indoor people. How many people took part in indoor and outdoor activities? [636]

32. There are large, medium and small baskets of pineapples. The small basket is half of the medium basket. The middle basket contains less 16 kg than the big basket, and the big basket is four times as big as the small basket. How many kilograms are there in the big, medium and small baskets? [32/ 16/8]

33. Pools of all sizes are not filled with water. If the big pond is full of water from the small pond, there is still 10 ton of water left in the small pond. If the small pond is full of water from the big pond, there will be 20 tons of water left in the big pond. It is known that the volume of a large pond is 1.2 times that of a small pond. How many tons of water are there in two ponds? [ 1 10]

Section 7 Age problem

1. My son is 10 years old this year. My mother was six times his age five years ago. How old is her mother this year?

This year, my father is 48 years old and my son is 20 years old. A few years ago, my father was five times as old as my son.

My father is four times as old as my daughter, and the sum of the ages of father and daughter was 49 years old three years ago. Q: How old are father and daughter now?

The father is 30 years older than his son, and the father will be three times older than his son next year. So how old is his son this year? The age difference between the two brothers is five years. Three years later, the elder brother is three times as old as four years ago. Q: How old are my brother and younger brother this year?

The sum of the two brothers' ages this year is 55 years old. My brother's age in a certain year is the same as this year's. That year, my brother was exactly twice as old as my brother. How old is my brother this year?

7. My brother's age five years ago is equal to my sister's age four years later. The sum of my brother's age two years later and my sister's age eight years later is 97 years old. How old are they this year?

8. 1994 The father is four times as old as his brother and younger brother. In 2000, my father was twice as old as my brother and younger brother. Q: When was my father born?

9. This year, the father was four times as old as his son. Twenty years later, the father was twice as old as his son. Q: How old are father and son this year?

10. Grandfather is 78 years old, eldest grandson is 27 years old, second grandson is 23 years old, and third grandson is 16 years old. Q: In a few years, grandpa's age will be equal to the sum of three grandchildren's ages?

1 1. Wang Mei is younger than his uncle 19 years old, and his uncle is older than Wang Mei 1 year old. Q: How old are they?

12. Xiaoming is 9 years old and his father is 39 years old. How many teenage fathers are exactly twice the age of Xiao Ming? 13. There are three people in a family, and the total age is 74 years old. My mother is two years younger than my father, and my mother is four times older than my son. Q: How old are these three people?

14. This year, the teacher is 46 years old and the student 16 years old. In a few years, twice the teacher's age is equal to five times the student's age.

15. There are three known grandparents and grandchildren. The age difference between grandfather and father is the same as that between father and grandson. The sum of the ages of grandfather and grandson is 82 years old, and the age of grandfather is exactly five times that of grandson next year. Q: How old are grandparents and grandchildren?

16. Xiaole asked how old Mr. Liu was this year. Teacher Liu said, "When I was your age, you were only 3 years old; I was 42 years old when you were my age. " Can you work out how old Miss Liu is?

17. The father is 30 years older than his son, and the father will be three times older than his son next year. So how old is his son this year?

18. Wang Mei is younger than his uncle 19 years old, and his uncle is older than Wang Mei 1 year old. Q: How old are they?

19. Xiaoming is 9 years old and his father is 39 years old. How many teenage fathers are exactly twice the age of Xiao Ming?

20. The father is four times as old as his daughter. Three years ago, the combined age of father and daughter was 49. Q: How old are father and daughter now?

2 1. There are three people in a family. Their ages add up to 74. Mother is two years younger than father, and mother is four times older than son. Q: How old are these three people?

22. This year, the teacher is 46 years old and the student 16 years old. In a few years, twice the age of teachers and five times the age of students will be equal.

23. There are three known grandchildren. The age difference between grandfather and father is the same as that between father and grandson. The sum of the ages of grandfather and grandson is 82 years old, and the age of grandfather is exactly five times that of grandson next year. Q: How old are grandparents and grandchildren?

24. Xiaole asked Mr. Liu how old he is this year. Teacher Liu said, "When I was your age, you were only 3 years old.": I was 42 years old when you were my age. " Can you work out how old Miss Liu is?