Teacher Liu's mathematical thinking
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01:06 Periodic problem. Today is Friday. What day is it in 80 days? 2024-06-19 10:24 -
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01:17 Third grade thinking training, equal replacement problem! 2024-06-15 12:59 -
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01:25 The sum of three boxes is equal to the sum of two circles 2024-06-13 11:03 -
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01:21 Third grade thinking training, A+A+B=15，B+B+A=12， Find the value of A × B! 2024-06-22 10:48 -
02:02 If you sell a garment for 100 yuan, you can earn 25%. If you sell it for 120 yuan, what percentage can you earn? 2024-06-22 10:48 -
01:50 The sum of three numbers is 120. A is 9 more than B, and C is 15 less than B. What are the three numbers? 2024-06-22 10:48 -
02:12 40g of sugar water containing 8% sugar, how many grams of sugar should be added to prepare the sugar water containing 20% sugar? 2024-06-22 10:47 -
02:05 One female student is missing, and the number of male and female students is equal. One male student is missing, and the number of female students is twice that of male students 2024-06-22 10:47 -
01:49 How many different three digit numbers can be formed by numbers 1, 4 and 3 in the third grade enumeration question? 2024-06-22 10:46 -
01:40 The road is 72 meters long. Eight trees are planted at an equal distance on one side of the road without planting at the head or tail. What is the distance between every two trees 2024-06-21 12:44 -
01:22 The original plan is to process 360 pieces in 8 hours, but the actual processing is 180 pieces in 3 hours. At this speed, we can advance several times 2024-06-21 12:40 -
02:33 Peaches are 15 more than pears, apples are 5 more than peaches, apples are twice as many as pears, apples, pears and peaches are several each 2024-06-21 12:38 -
01:43 The division quotient of two numbers is 3, the dividend, divisor, the sum of quotients is 83, and how many are the dividend and divisor respectively 2024-06-21 12:33 -
01:19 A batch of paper bound picture books, 18 pages each, 300 copies can be bound, 20 pages each, and a few fewer can be ordered 2024-06-21 07:30 -
01:09 There are 76 shuttlecocks, and 4 shuttlecocks are three times more than football. How many are there in football? 2024-06-21 07:29 -
01:25 A is 3 times larger than B, and A is 12 times larger than B. What is A? 2024-06-20 13:20 -
01:27 There are 60 comic books for the three, three for A and five for B, and the three are the same 2024-06-20 13:04 -
01:05 360 books should be distributed to grade 2 and 3. The number of books distributed to grade 3 is three times that of grade 2. Grade 2 and grade 3 should be scored respectively 2024-06-20 12:33 -
01:21 There are 25 students in a row. There is a boy between every two girls. The first one is a girl 2024-06-20 12:15 -
01:29 Party A is three times larger than Party B. The sum of Party A and Party B is 20. How many are each? 2024-06-20 12:08 -
02:14 For the required period question, what is the single digit number of the product of 25 4 times? 2024-06-20 12:01 -
01:50 The water in bucket A is 20% more than that in bucket B, and the water in bucket C is 20% less than that in bucket A. Which bucket is more water in bucket B and bucket C? 2024-06-19 10:25 -
01:20 A and B are two numbers. A plus 40 equals B, and B plus 30 equals 2 times of A. What is A equal to? 2024-06-19 10:25 -
01:06 Periodic problem, today is Friday, what day is it 80 days later? 2024-06-19 10:24 -
01:37 For parts processing, it takes 4 days for Party A to do it alone, and 5 days for Party B to do it alone. When the two people work together, Party A is 20 more than Party B 2024-06-19 10:24 -
03:16 There are 50 fewer peach trees than apple trees, 1/3 of apples is equal to 2/5 of peaches, pear: apple=2:3 2024-06-19 10:23 -
02:27 A barrel of oil is 38kg after being used twice, 40% for the first time, 12kg more than that for the second time 2024-06-19 10:22 -
01:21 The price of a garment is reduced by 60 yuan. Now the price is 2/7 lower than the original price. How much is the current price? 2024-06-18 17:06 -
01:23 Four years ago, the age difference between father and son was 24 years old. This year, the age of father is three times that of son. How old is the son this year 2024-06-18 16:01 -
01:56 The two numbers of A and B are equal. A decreases by 50, and B increases by 30. B is - 3 times of A, so both A and B are 2024-06-18 15:04 -
01:26 Party A and Party B will meet in 6 hours. If they walk 3 kilometers each hour, they will meet in 4 hours 2024-06-18 14:06 -
01:51 The sum of 1/3 of A and 1/4 of B is 10, and the sum of A and B is 34. What is each of A and B? 2024-06-18 13:00 -
01:15 An elementary school math thinking training problem that baffles the whole class, and the operation rules of symbols 2024-06-18 07:53 -
01:29 The students went to move bricks, and each person moved 4 pieces, leaving 7 pieces. Each person moved 6 pieces, and 7 pieces were missing. How much should we transfer 2024-06-17 13:33 -
01:03 A lot of students can't do the fifth grade fraction equation, so it's important to find the right method 2024-06-17 08:30 -
01:54 Apples are 3 yuan a jin, pears are 4 yuan a jin. I bought 10 jin of fruit in total, and spent 34 yuan to buy apples 2024-06-17 08:29 -
02:25 Add 2kg salt to the salt water containing 5% salt, and it will become 10% salt water. Calculate the weight of the original salt water 2024-06-17 08:27 -
02:36 From place A to place B, Party A will walk for 15 hours, and Party B will depart from both places at the same time and face each other in 25 hours 2024-06-17 08:27 -
01:59 The multiple problem, A is 3 times more than B, and A is 15 times less than B, how many are A and B respectively? 2024-06-17 08:27 -
01:12 My sister is 8 years old this year. Nine years later, my sister will be 40 years old. How old is my sister this year? 2024-06-16 16:05 -
01:23 A basket of pears weighs 48 kg in total, and the remaining basket after half of the pears are sold weighs 25 kg in total 2024-06-16 15:04 -
01:38 7 cows can be exchanged for 16 sheep, 2 sheep can be exchanged for 21 rabbits, and 3 cows can be exchanged for several rabbits? 2024-06-16 14:04 -
01:27 The elder brother had 15 candies, the younger brother had 27 candies, and the mother gave them 20 candies. Same amount after distribution 2024-06-16 12:57 -
02:16 Three persons are 45 years old, and the sum of the ages of A and B is twice that of C; A is 4 years older than B, and three persons 2024-06-16 11:58 -
01:57 A batch of parts will be completed in 3 days by Party A alone, and in 4 days by Party B alone, and 24 more tasks will be completed by Party A than by Party B through cooperation 2024-06-16 06:53 -
01:35 The third and fourth grade thinking training, graphics problems into poor times easy to solve! 2024-06-15 13:16 -
02:16 There are 44 chickens and rabbits in the same cage. The chicken has 4 more legs than the rabbit. How many chickens and rabbits each? 2024-06-15 13:13 -
01:17 Third grade thinking training, equal replacement problem! 2024-06-15 12:59 -
01:01 The sum of A and B is 27, and A is 3 larger than B. What is the number of A and B respectively? 2024-06-15 07:55 -
01:34 Score word problem: I walked 2/3 of the way, 3 kilometers from the midpoint. How long is the road? 2024-06-15 07:54 -
01:24 For a road, Party A will repair it in three days, Party B will repair it in six days, and how many days will Party A and Party B cooperate to repair it? 2024-06-15 07:53 -
01:20 The sum of three numbers is 180, number A is twice that of number B. Number C is 20 more than number B. What are the three numbers 2024-06-14 08:58 -
01:09 The average number of five numbers is 10. After removing one number, the average number becomes 9. What is the number removed 2024-06-14 08:57 -
01:51 After drinking half of a cup of milk tea, sprinkle 90 ml, and there is 20% left. How many ml of this cup of milk tea 2024-06-14 08:55 -
01:26 In a multiplication calculation, a multiplier 12 is regarded as 21, and the result is 72 more. What is the correct result 2024-06-14 08:55 -
01:31 It takes 2 hours to fill a pool with water and 4 hours to drain the water at the same time 2024-06-14 08:54 -
01:23 On the question of score reduction, I read more than 1/3 of 5 pages of a book, and there are still 75 pages left. How many pages are there in this book 2024-06-14 08:52 -
01:56 Xiao Ming is 500 yuan and Xiao Li is 300 yuan. After they spend the same amount of money, Xiao Ming is three times as much as Xiao Li 2024-06-13 16:10 -
01:25 For a two digit number, an extra 0 is written at the end, increasing by 117. What is this two digit number? 2024-06-13 11:05 -
01:30 Xiaoming has 64 flowers and Xiaoli has 36. After Xiaoli gives Xiaoming several flowers, Xiaoming is four times as big as Xiaoli 2024-06-13 11:04 -
02:19 There are 135 people in the three classes, five more people in the second class than in the first class, seven fewer people in the third class than in the second class, and more people in each of the three classes 2024-06-13 11:04 -
01:25 The sum of three boxes is equal to the sum of two circles 2024-06-13 11:03 -
01:44 There are 20 bicycles and tricycles with 50 wheels in total. How many tricycles are there? 2024-06-13 11:03 -
01:22 The decimal point of a number moves one place to the right, increasing by 7.2. What is the original number? 2024-06-12 13:40 -
01:21 A number adds 6, multiplies 6, subtracts 6, and finally divides by 6. The result is still 6. What is the original number? 2024-06-12 08:34 -
01:26 Xiao Ming bought a pen, but when he bought 3 pens, he left 8 yuan, and when he bought 5 pens, he left 2 yuan. How much is a pen? 2024-06-12 08:34 -
02:29 When a sister is as old as her sister, she is 5 years old. When a sister is as old as her sister, she is 26 years old 2024-06-12 08:34 -
01:51 One bag of apples takes away more than two apples in half, and then takes away more than three apples in half, leaving nine apples. How many apples are there 2024-06-12 08:32 -
01:07 Xiaohong has 60 yuan, three times less than Xiaoli. How much does Xiaoli have? 2024-06-12 08:32 -
01:20 In the second and third grade thinking training, fill in five consecutive natural numbers in the box to make the sum 35! 2024-06-11 14:26 -
02:27 The dividend, divisor, quotient, remainder sum is 1167, quotient 3, remainder 96, what is the dividend? 2024-06-11 13:47 -
02:50 The first half of the rice was 10 kilograms less, and the second half was more than 10 kilograms, leaving 20 thousand 2024-06-11 13:28 -
01:31 In the thinking training of grade three and four, fill in the same number in the box. 2024-06-11 08:24 -
01:45 5/14 of the first reading, 4/5 of the second reading, 36 pages more read than unread 2024-06-11 08:23 -
02:15 The chicken and rabbit have 152 legs in total. There are four chickens twice as many as the rabbit. How many chickens and rabbits each? 2024-06-11 08:21 -
01:06 The chicken and rabbit are in the same cage. The number of chicken and rabbit is equal. There are 30 feet in total. How many chicken and rabbit are there? 2024-06-10 08:21 -
02:56 65 kilometers in the first hour, 1/3 of the whole journey in the second hour, 15 kilometers above the midpoint 2024-06-10 08:20 -
01:44 There are 32 more boys than girls and 4 fewer boys than girls. How many boys and girls are there? 2024-06-10 08:20 -
01:23 There are 90 chickens and rabbits in the same cage, with the same number of feet. How many chickens and rabbits are there? 2024-06-10 08:20 -
01:29 Xiao Li goes to the store to buy water. A bottle of water costs 2 yuan. If you buy four bottles, you can get one free. How many bottles can you get for 30 yuan 2024-06-10 08:20 -
02:07 A and B have 53 sugars in total. After A gave B 8 sugars, B still has 7 fewer than A, how many sugars did A have? 2024-06-10 08:19 -
01:30 A and B teams have 60 people in total. After A transferred 6 people to B team, the number of the two teams was equal 2024-06-08 11:46 -
01:12 One tractor cultivates 80 hectares of land in five hours. According to this calculation, how many hectares of land will be cultivated in four hours for three tractors 2024-06-08 11:45 -
01:12 Xiao Ming buys ice-cream, 2 yuan for one ice-cream, 5 for one, how much does it cost to get 36 ice-cream? 2024-06-08 11:45 -
01:36 This year, Xiaoli is 23 years old and her grandfather is 73 years old. A few years later, her grandfather's age is three times that of Xiaoli. 2024-06-08 11:45 -
01:42 There are 175 red flowers and blue flowers in total. There are 5 red flowers less than 3 times of blue flowers. How many are there in each of the two kinds of flowers. 2024-06-08 11:45 -
01:20 Third and fourth grade often take an examination of word problems! Party A and Party B build a road with a length of 100 kilometers, and Party A builds 4 kilometers a day 2024-06-08 11:42 -
01:52 Xiaoming is 4 years old this year, and his mother is 29 years old. How many years later, his mother's age is more than three times that of Xiaoming, 5 years old? 2024-06-07 15:13 -
02:02 Mathematics thinking training for grade three: 2 pears+3 peaches=12 yuan, 3 pears+2 peaches=13 yuan 2024-06-07 14:48 -
02:17 Party A and Party B walk in opposite directions. They meet in 4 hours. Party A drives 10 kilometers more than Party B every hour 2024-06-07 14:37 -
01:52 The fourth grade travel problem, Party A and Party B travel from two places 300 kilometers away, and haven't met in three hours 2024-06-07 09:34 -
02:28 A is 40 times less than B, and A is 16 times more than B, and how many are A and B respectively? 2024-06-07 09:34 -
01:56 Pour 30% of a barrel of oil for the first time, 3 kg for the second time, and 10% for the first two times for the third time 2024-06-07 09:34 -
01:22 Poor times. Party A is 71 times more than Party B, and Party A is 7 times more than Party B. How many are Party A and Party B respectively? 2024-06-06 19:07 -
01:17 There are 180 chicken and rabbit legs in total. The number of rabbits is twice that of chickens. How many chickens and rabbits are there? 2024-06-06 18:08 -
01:33 Time cycle problem, fast solution! June 1 is Thursday, and June 25 is what day of the week? 2024-06-06 15:17 -
02:31 The age of the elder brother five years ago is equal to that of the younger sister three years later. When the elder brother is several years old, his age is three times that of the younger sister 2024-06-06 15:02 -
02:10 An express train departs from the local train relatively. The express train travels 90 kilometers per hour, and the local train travels 60 thousand per hour 2024-06-06 10:00 -
03:12 The two cars meet 60 kilometers away from the midpoint. The speed ratio of the two cars is 8:5. What is the distance between the two places 2024-06-06 09:59 -
02:30 A square flower bed is surrounded by a 1m wide cement road, with a total area of 12 square meters 2024-06-05 18:36 -
01:16 Mother is 24 years older than Xiao Ming, and her mother's age is three times that of Xiao Ming. How old are mother and Xiao Ming respectively? 2024-06-05 16:36 -
01:44 Xiao Ming had 16 yuan. After giving Xiao Hong 3 yuan, they both had the same amount of money. How much did Xiao Hong have? 2024-06-05 15:34 -
01:42 Xiaoming is 4 years old this year, and his mother is 34 years old. A few years later, her mother's age is more than three times that of Xiaoming. 4 years old? 2024-06-05 14:32
