1. The first problem of puzzle mathematics in the second grade of primary school
1, every three empty bottles can be replaced with a soda. Someone bought 27 bottles of soda and changed them into empty bottles after drinking, so he can drink at most () bottles of soda. Xiaoming and Liang Xiao want to buy the same book. Xiao Ming is short of 1 yuan 7 jiao, and Xiao Liang is short of 1 yuan 3 jiao. If they use their money to buy the book together, the money is just right. What's the price of this book? How much money did they each bring?
3. Four teams participated in the basketball game, and every two teams played once, with a * * * match ().
4. Little tortoise, rabbit and kitten race. As a result, the kitten said, "I am not the first"; The little turtle said, "I'm at the end." Guess their ranking. The first place is (), the second is (), and the third is ().
Xiaodong and Obana Wang Wei are taller than each other. Wang Wei said, "I, Xiaohua, am not the shortest." Please guess their height. The shortest is ().
2. Puzzle math problems in the second grade of primary school
1. There are 12 lighted candles on the table. First three were blown out by the wind, and then two were blown out by a gust of wind. Finally, how many candles are left on the table? 2. The fox bought a fur coat from 45 yuan in the old goat shop with counterfeit money from 50 yuan, and the old goat returned the money from 5 yuan to the fox. Do you know how much the old goat lost?
3, 24 people lined up, one, two, two steps forward, ask: how many people stay put?
There are five lights on one side of the alley. Every two lamps are 8 meters apart. How long is this alley?
5. 10 cars line up, counting from the back, the black car is the sixth, then, counting from the back, where is it?
3. The second grade elementary school puzzle math problem three
1, a rope has two heads, and how many heads do three and a half ropes have? 2. After the second grade gives nine books to the first grade, there are as many books in the two grades. How many books are there in Grade Two than in Grade One?
3. Two construction teams have a total of 100 people. If 20 people are transferred from Team A to Team B, then the number of the two construction teams is the same. How many people are there in each of the two engineering teams?
The following is the arrangement of numbers. Can you find their rules? Which line has different rules from the other three lines? Give it a try and don't lose the chance. () line
( 1)6、7、8、9、 10
(2)5、6、7、8、9
(3)2、4、6、8、 10
(4)3、4、5、6、7
Can you find the arrangement of these numbers? When you find it, fill in the appropriate numbers in the brackets.
( 1)5、 10、 15、20、25、()、()、()。
(2) 1、3、5、7、9、 1 1、()、()、()。
(3)3、6、9、 12、 15、 18、()、()、()。
(4)2、4、8、 16、32、()、()、()。
(5)64、56、48、40、()、()、()。
(6)960、480、240、()、()、()。
4. Puzzle 4 of Puzzle Math in Grade Two of Primary School
1. Fill in the blanks with 1. Choose the appropriate number from 62, 27, 54, 73, 38, 28 and 46.
()+()=()+()=()+()
2. After Xiao Ming gave Xiao Jun 18 yuan, they had the same amount of money, so Xiao Ming had () yuan more than Xiao Jun.
3, students do exercises, from top to bottom, Xiaojun is in the 28th, from bottom to top, Xiaojun is in the 27th, this team has () students.
Xiaoming lives on the fifth floor. It takes him 1 minute to get to the next floor, and () minutes to go home from the sixth floor to the fifth floor.
5. Xiaoli gets 6 flowers, Xiaohua gets 3 times more flowers than Xiaoli, and Xiaohua gets () flowers.
Second, clever calculation (calculation by simple method)
1、400-29+362-7 1+38
2、399+299+599+ 199
Third, the application problem.
There are 43 students in Class 2, Grade Two, 1, 2 less than Class 2 and 4 more than Class 2, 1. How many students are there in Class 1 * * 3?
A basket of apples weighs 30 kilograms. After selling half of the apples, the basket weighs18kg. How much does this basket weigh? How much does this apple weigh?
3. weigh three people. Party A weighs 52kg, Party A weighs 46kg and Party B weighs 48kg. How many kilograms does everyone weigh?
The black cat caught 15 fish, the white cat caught 5 fish and the flower cat caught 7 fish. How many fish should a black cat give to a white cat and a flower cat, and how many fish should three cats have?
5. Math Problem Five in Grade Two
1, six children are divided into one bag of apples and two bags. How many apples are there in this bag?
Xiaoming's family eats four apples in the morning, noon and evening. How many apples did Xiao Ming's family eat a day?
3、99999+9999+999+99+9=()
4、93+96+97+95+89+90+94+87+95+92=()
5、36 1+972+ 1639+28=()
6、 1+2+3+…+38+39+40=()
7、(2+4+6+……+38+40)-( 1+3+5+……+37+39)=()。
8. Xiaohua has 10 red balloons, and Xiaohua has 8 yellow balloons. Xiaohua exchanged four red balloons for three yellow balloons for Xiaohua. How many balls does Kobanawa Xiaohua have now?
9. There are 9 students in the art interest group in Xue Fan primary school, and there are as many students in the calligraphy interest group as in the art interest group. How many students are there in these two interest groups?
10, it's getting late. Mom asked Xiaoming to turn on the light in the room, but the naughty Xiaoming pulled the switch nine times in a row. Can you tell me whether the light is on or off at this time? What about 20? 100?