1. Xiaohua's father can cut off five of his own nails in 1 minute. How many nails can he cut in five minutes?
Xiaohua took 50 yuan's money to the store and bought a car worth 38 yuan, but the salesman only gave him 2 yuan money. Why?
Xiaojun said: "I went fishing yesterday and caught a tailless fish, two headless fish and three half-baked fish." Guess how many fish I caught? " Students, guess how many fish Xiaojun caught?
4.6 horses and a cart ran six miles. How many miles did each horse run? How many miles did six horses run at a time?
5. A puppy tied to a tree trunk greedily eats a bone on the ground, but the rope is not long enough, which is 5 cm shorter. How do you teach dogs to scratch bones?
6. Wang walks from place A to place B. 1 minute later, Li walks from place B to place A. When Wang and Li meet on the road, who is farther from A?
7. The clock just struck 13. What should you do now?
8. On the vast grassland, there is a cow eating grass. This Niu Yi only ate half of the grass on the grassland in 2008. Q: How many years does it take to eat all the grass on the lawn?
9. Mom has seven pieces of candy. She wants to give them to the three children equally, but she doesn't want to cut the remaining candy. What should mom do?
10. There is a row of trees along the road in the park, and the distance between each tree is 3 meters. What is the distance between the first tree and the sixth tree?
1 1. Divide 8 in half, as shown below. How much is each half? The average score of arithmetic method is _ _ _ _ points, from which the horizontal score is _ _ _ _ points, and from which the vertical score is _ _ _ _ _ points.
12. A house has four corners, one corner has a cat, and there are three cats in front of each cat. How many cats are there in the room?
13. The house has four corners. There is a cat in a corner. There are four cats in front of each cat. How many cats are there in the room?
14. Xiaojun, Xiaohong and Xiaoping play chess. They always play three sets. Ask them how many games they played. (Every chess game is played by two people)
15. Xiaoming and Xiaohua each have a bag of sweets, but I don't know how many pieces there are in each bag. I only know that after Xiaoming gave Xiaohua 8 yuan, Xiaohua gave Xiaoming 14 yuan. At this time, the amount of sugar in their bags is exactly the same. Students, who do you think has more sugar? How much more?
Answer:
1.20, including fingernails and toenails.
2. Because he paid the salesman 40 yuan, he only gave him 2 yuan; 3.0, because the fish he caught does not exist;
4.6 Li, 36 Li;
Just teach the puppy to turn around and grab the bone with its hind feet.
6. They were in the same place when they met, so they were as far away from A;
7. This clock should be repaired;
8. It will never eat all the grass, because the grass will always grow;
9. Mom eats one piece first, and then gives two pieces to each child;
10. 15m；
1 1.4,0,3.
12.4;
13.5;
14.2 disk;
15. It turns out that there are many florets; 14-8=6 pieces, because the number of candy pieces of two people is exactly the same, so the result is that there are more small flowers than Xiaoming 12 pieces.
Interesting questions and reference answers of primary school mathematics II
Interesting math problem (with answers) (full mark 100, time 100 minutes)
I. Fill in the blanks (3 points for each question, ***2 1 point)
1, Word Formula Game:
For example: (10) take (9) stable (7) upper (8) lower = (3) position (1)
The corresponding formula is:109–78 = 31.
(1) () light () color × no () price = () goods company
② () () Urgent × () means Lian Xin = () () Rich people.
(3) () () Zodiac × (Jump = () () ()
(4) () (face down a peg or two ×) = () Yan () color
(5) () Fishing for days x () drying the net for days = () Parents deny it.
Answer: (1) five, ten, two, hundred; (2) ten, ten, ten, hundred, ten thousand; (3) Ten, two, three, three, ten, six;
(4) eight, seven, five, six; (5) three, two, six.
2. Calculate 19+299+3999+49999 =.
Answer: 543 16
3. Fill in the numbers according to the law: 1, 1, 2, 3, 5,,.
Answer: 8,13,21.
4. Fill in the operation symbols or brackets on the horizontal line to make the equation hold. 4 _ _ 44 _ _ 4 = 1, 4 _ _ 4 _ _ 4 = 2,4444 = 3,4444 = 4.
Answer: (4÷4)×(4÷4)= 14÷4+4÷4=2.
(4+4+4)÷4=34×(4–4)+4=4
5. Cut off a corner of the rectangle, which may be a side shape.
Answer: three, four, five
6. There are 50 students wearing hats numbered 1, 2, 3, 49 and 50 respectively. They play the game in a circle clockwise: starting from 1, count off clockwise "1, 2, 1, 2". 1, 2, "Count off, odd students quit. After several rounds, there was only one person left in the circle. So, this student's original number is.
Answer: 32
7. There is a cube with letters A, B, C, D, E and F on each side. There are three: a, b and C.
Students observe from different angles, and the results are shown in the figure. Ask this.
What are the letters on each side of the cube? That is, contrary to a;
B relative; Opposite ebfc is;
Opposite ad is; Opposite ccddae is;
F on the contrary.
Answer: e, d, f, b, a, c.
Second, the answer (***79 points)
8.(7 points) Men love to take advantage of small things. Once he went to buy onions and asked, "How much is a kilo?" "Twenty cents a kilo."
The onion buyer said, "I bought them all, but I have to weigh them separately and cut them in the middle with a knife." I'll give you 65438+ 0.6 cents per kilogram of onion white and 4 cents per kilogram of onion leaves. Do you sell it or not? " The onion seller thinks it's ok. But after selling it, he lost half of it. Excuse me, why did he lose so much money?
Answer: Because the onion buyer spent 20 cents on 2 kilograms.
9.(8 points) Teacher Zhang is very busy at work. She hasn't been home for five days. When she got home, she tore up a five-day calendar. The total date of these five days is 45. What is the date when Teacher Zhang comes home?
Answer: 12
10, (8 points) There were 9 birds in the tree, and the hunter killed them with a gun 1. How many birds are left in the tree at this time?
Answer: (1) There are no birds on the tree; (2) There are 8 birds in the tree; There are five birds in the tree. And so on.
1 1, (8 points) According to the following equation, how much did your mother spend on fish, chicken and vegetables?
Chicken+duck+fish+vegetables =35.4 yuan.
Chicken+fish+vegetables =20.4 yuan
Duck+fish+vegetables =2 1.4 yuan.
Duck+vegetables = 17 yuan
Answer: Fish: 4.4 yuan; Duck: 15 yuan; Chicken: 14 yuan; Dish: 2 yuan.
12, (8 points) Write the idioms you think of on the horizontal lines according to the horizontal lines and vertical lines in each picture below.
Answer: in twos and threes; Seven ups and eight downs; Three long and two short; muddledness
13, (8 points) When the weekend came, Qingqing's mother asked Qingqing a question when washing clothes:
After the dirty clothes are fully rinsed with washing powder, the clothes should generally be tied tightly before rinsing. Assuming that there is still 1 kg of water containing dirt in the clothes after tightening, the existing 10 kg of clean water can be rinsed in the following three ways: Method 1: Rinse the clothes directly in 10 kg of water once:
Method 2: Divide10kg of water into two parts, one is 3kg, and the other is 7kg, and wash it twice:
Method 3: Divide 10 kg into two parts, each part is 5 kg, and rinse it twice.
Mother asked Qing Qing, which method is the cleanest for washing clothes?
Answer: the clothes washed in method three are the cleanest.
14, (8 points) A barrel of paint can draw an area of 65 square meters. Xiaoming's home is decorated. Two walls are 3.2m high and18.4m wide, and three walls are 3.2m high and 2.8m wide, which need painting. Q: How many barrels of this paint should I buy? Answer: 3 barrels
15, (8 points) Observe the following two groups of formulas:
①2=2,2=4,2=8,2= 16,2=32,2=64,27= 128,2=256 1234568
②(22)3=22×3=2=64
Through observation, write the last digit of 8 with the law you found; The last digit of 169 is 327.
Answer: 6; 6; eight
16, (8 points) The basic price of electricity for residents in a city is 0.40 yuan per kWh. If the monthly electricity consumption exceeds 70 kWh, the excess will be charged at 70% of the basic electricity price.
(1) If a household's electricity consumption in March is 30 degrees, it should be charged RMB;
(2) If the electricity consumption of a household in March is 100 kWh, RMB should be charged;
③ We can get it from ① and ②: If the average price is 0.40 yuan (fill in "