The third lecture? Sum and difference multiple problem 1

Content overview

Master the basic solutions of sum times, difference times and sum difference problems, and then learn to deal with the difference times between simple sums and multiple quantities. Focus on learning how to express quantitative relations with line graphs.

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Interesting articles

1.？ Xiaoyue and Dongdong participated in the tree planting activities organized by the school. They planted a total of 12 trees, of which the trees planted in winter and winter are twice as many as dozens of abortion trees. How many trees have been planted in winter?

Analysis: 8 trees

2.？ There are 160 items in the two piles A and B. It is known that there are 40 items in the pile A that are three times more than those in the pile B. How many items are there in the two piles A and B?

Analysis: a pile of 130 blocks; B pile of 30 pieces

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3.？ There are some fairy tales and science fiction novels on the shelf, a total of 47. The number of fairy tales is four times less than that of science fiction. How many science fiction books are there on the shelf?

Analysis: 10 copies

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4.？ In order to find a job, Xiao Chen prepared two resumes in Chinese and English. Chinese resume has three times as many words as English resume, and Chinese resume has more words than English resume. What is the number of words in Chinese resume?

Analysis: 330

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5.？ Xiaoyue and Archie are practicing running on the playground. After a while, Archie ran 80 meters three times more than Abortion. If Xiaoyue runs 500 meters less than Archie, how many meters did Xiaoyue and Archie run?

Analysis: 920 meters

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6.？ It turns out that the pages of Huacheng Daily and Pengcheng Evening News are the same. Later, Huacheng Daily expanded its layout and added 10 version, so the layout of Huacheng Daily was four times less than that of Pengcheng Evening News, and two versions were missing. How many pages are there in each newspaper now?

Analysis: Pengcheng Evening News 4th Edition; Huacheng Daily 14 Edition

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7.？ Dongdong appraised two model cars in a toy store. If you buy both, you need 400 yuan altogether. It is known that the difference between the two models is 60 yuan. How much is each model?

Analysis: 230 yuan; 170 yuan

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8.？ Torchbearers A and B are responsible for passing the torch from place A to place B. First, Party A starts from place A and passes the torch to Party B on the way; B took the torch and continued jogging to B. It is known that A and B are 2400 meters apart, and A ran 600 meters more than B. Excuse me, how many meters did you run at a time?

Analysis:1500m

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9.？ Yucai Primary School has three classes in grade three, with a total of 126 students. If class one has four more people than class two, and class two has four more people than class three, how many people are there in these three classes?

Analysis: There are 46 students in Class One, 42 students in Class Two and 38 students in Class Three.

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10.？ There are 105 sweets in three piles, of which the number of sweets in the first pile is three times that in the second pile, and the number of sweets in the third pile is three times less than that in the second pile. How many sweets are there in the third pile?

Analysis: 33 pieces

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Extended article

1.？ There are 480 employees in this textile factory, of which the number of female employees is three times that of male employees. Excuse me: How many male and female employees are there?

Analysis: Male employees 120, female employees 360.

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2.？ A traffic coordinator issued 78 tickets in July. These tickets are divided into two types: one is illegal parking and the other is running a red light. There are more tickets for illegal parking, four times more than for running a red light. How many tickets are there for illegal parking?

Analysis: 63 pieces

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3.？ There are 67 pear and apple trees in the orchard. The number of pear trees is twice less than that of apples. How many apple trees are there?

Analysis: 23 trees

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4.？ There are five monkey mountains in the zoo, three of which are inhabited by golden monkeys and two by macaques. The number of monkeys in these five monkey mountains is 10, 15, 30, 35 and 70 respectively. The total number of known golden monkeys is three times that of macaques. Q: Which two mountains are inhabited by macaques?

Analysis: There are 10 monkeys and 30 monkeys living on the mountain.

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5.？ There are three times more girls than boys in the school choir, and there are 80 more girls than boys. How many boys and girls are there in the choir?

Analysis: 40 boys and 20 girls/kloc-0.

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6.？ There are two kinds of digital cameras, one is a high-grade professional camera, and the other is an ordinary household camera. Home cameras are cheaper, 4600 yuan cheaper than professional cameras. The money for buying 1 professional cameras is enough to buy 4 household cameras, leaving 100 yuan. Excuse me, what is the price of a professional camera?

Analysis: 6 100 yuan

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7.？ These two baskets of apples are equally heavy. Now the first basket in western Europe takes out 12 kg of apples and puts them in the second basket. As a result, the apples in the second basket are 2 kilograms less than those in the first basket. How many kilograms are there in two baskets of apples?

Analysis: 25 kg each.

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8.？ In the Asian Cup finals, the number of journalists from China is three times that of foreign journalists. After the game, China 180 journalists left, 40 foreign journalists left, and the remaining Chinese and foreign journalists were equally divided. How many Chinese and foreign journalists are there?

Analysis: 70 foreign journalists and 265,438+00 China journalists.

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9.？ In 2006 and 2007, Mr. Zhang made a total profit of 400,000 yuan by investing in stocks, including 65,438 yuan in 2006 and 400,000 yuan in 2007. How much did Mr Zhang earn in 2007?

Analysis: 270,000 tons

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10.？ The members of the ground control room of the lunar landing operation are composed of two groups of experts, with a total of 125. There were many people in the first group, so 20 people were transferred from the first group to the second group. Even so, the number of people in the first group is still five more than that in the second group. How many experts are there in the first group?

Analysis: 85

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1 1.？ Three granaries A, B and C have 109 tons of grain ... Among them, the total grain of granary A is three times that of granary B, which is 1 ton, while the total grain of granary B is twice that of granary C. Q: How many tons of grain does granary A store more than granary C?

Analysis: 6 1 ton

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12.？ When two natural numbers are divided, the quotient is 4 and the remainder is 1. If the sum of dividend, divisor, quotient and remainder is 56, what is the dividend?

Analysis: 4 1

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Beyond the article

1.？ The two sisters do math and Chinese homework together. My sister spends 10 minutes more on math homework than her sister. My sister spends 4 minutes more time on Chinese homework than my sister. It is known that it took my sister 88 minutes to finish her homework, but her math homework took 12 minutes less than her Chinese homework. Excuse me: How many minutes did my sister spend doing her Chinese homework?

Analysis: 47 minutes

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2.？ Two artillery battalions participated in the military exercise and each prepared a number of shells. At first, Battalion One prepared five more shells than Battalion Two. Later, because of the need of the exercise, the first battalion gave the second battalion 20 shells. At this time, the number of shells in the second battalion is more than three times that of the first battalion. How many shells did Battalion 1 begin to prepare?

Analysis: 36 pieces

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3.？ Boys in swimming pools are 6 times less than girls 1 1 and 4 times more than girls 13. So how many boys are there?

Analysis: 6 1 person

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4.？ During the Three Kingdoms period, Wei, Shu and Wu were at war. It is known that Wu's army was 200,000 more than Shu's. The number of Wei Jun is twice that of Wu and three times that of Shu. How many people are there in Wei Jun?

Analysis: 65438+200,000

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5.？ In the third grade of Hongqi Primary School, there are three classes A, B and C, with a total of 162 students. If two people are transferred from Class A to Class B, the number of students in Class A and Class B is the same. If this is to transfer three people from Class C to Class B, then the number of people in Class B and Class C is the same. Excuse me, how many people are there in Class A?

Analysis: 54 people

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6.？ Party A and Party B go shopping in the store with 80 yuan money. Party A bought a comic book with half the money he brought, and Party B bought a tape for 10 yuan. At this time, the money left by A is exactly three times that of B, so how much money did B bring?

Analysis: 20 yuan

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7.？ At the Olympic Games, a country won twice as much silver as bronze. Archie found that if the country wins 1 gold medal again, then the number of gold medals is the sum of the number of silver medals and the number of bronze medals; If 1 gold medal becomes a silver medal, then there are as many gold medals as silver medals. Excuse me: How many gold medals has this country won?

Analysis: 8 pieces

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8.？ Xiao Yun, Xiao Da, Jessica Hester Hsuan and Archie spent a total of 154 yuan in the amusement park. Interestingly, Xiaoyun's money plus 5 yuan equals Xiaoda's money minus 7 yuan, equals Jessica Hester Hsuan's money multiplied by 3, and equals Archie's money divided by 4. How much did Xiao Da spend?

Analysis: 3 1 yuan