The answer is as follows:

Fill in the blanks

1、7 27

2、6

3、48

4、6

5、88

6、34

Pages 7, 2, 3 and 6

8、2 1

9、 10 5

10、30

1 1、20

12、44

Second, answer the question.

13, 50 seconds later, at this time, Party A charges 40 meters at point A, and Party B charges 60 meters at point A..

14, at least 15 12 yuan.

15, everything bought in a is cheap, and * * * costs 80 1 yuan.

16, two answers

1, 8 points and 6 branches, 12 points 1 branch, 14 points 18 points and 2 branches.

2, 8 points 5, 12 points 2, 14 points 2, 18 points 1.

The topic is as follows:

The 10th Primary School "Hope Cup" National Mathematics Invitational Tournament Grade Four Test II

I. Fill in the blanks (4 points for each small question, ***60 points)

The 10th "Hope Cup" National Mathematics Invitational Tournament for Primary School Students

The second exam in grade four

Grade: Name: Student ID: Achievement:

1. Fill in the blanks (5 points for each small question, ***60 points)

1. Arranges six consecutive natural numbers from small to large. If the sum of the last three numbers is twice that of the first three numbers, then the largest number among the six numbers is the sum of the six numbers.

2. Provisions: N A's are multiplied, and it is recorded as: a× a× …× a× a = an.

ordinary

Observe the following calculations: Not applicable.

8 1=8; 82=64; 83=5 12; 84=4096; 85=32768; 86=262 144; 87=2097 152; 88= 167772 16,…

And 820 12 is divided by 10, and the remainder is.

3. If the product of six consecutive odd numbers is 135 135, then the sum of these six numbers is.

This year, my sister is three times as old as my sister. In two years, my sister will be twice as old as my sister. So, this year, my sister is.

5. The keyboard of type A computer has 104 keys, which is 72 keys less than that of type B piano, so the keyboard of type B piano has 6 keys.

6. As shown in figure 1, the plan of the top structure of the building is composed of 1 1 pieces of steel, and the number of triangles in the figure is.

7. Given that m> 1 and the sum of m consecutive natural numbers is 33, then all possible values of m are.

8. There are two numbers: 515,53. Subtract 1 1 from the first number and add 1 1 to the second number. This is an operation, so after the operation, the first number and the second number are equal.

9. Put 1 1 balls in three boxes, so that the number of balls in the boxes is different from each other. Then, the box with the most balls can hold at most one ball, or at least one ball.

10, as shown in Figure 2. In right-angle BDEF, AB=24 (cm), EF= 15 (cm), and the shadow area △BCE is 60 square centimeters, so the area of △DCE is square centimeters.

1 1. The two ends of a bus line are Station A and Mile Mile Mile Station respectively. The bus company stipulates (1) that each bus should complete a one-way trip within 50 minutes (including the stop time at the intermediate station), and stop driving at one end 10 minutes. (2)A train leaves every 6 minutes at Station A and Mile Mile.

Then, at least one bus is needed on this bus line.

12, before New Year's Day, Xiao Fang made greeting cards for five students. When she put them in the envelope, she put them in the wrong place. None of the five students received the greeting cards made by Xiao Fang for themselves, but Xiao Fang gave them to others. There is a possible situation.

2. Solve the problem (0/5 for each question, 60 for * * *, and write the calculation process for each question)

13, one day, in the foggy weather in M city, only objects within 100 meters can be seen clearly. Two people, A and B, set off in opposite directions at the same time at point A on a straight road. Their speeds are 4 m/s and 6 m/s respectively. 1 minute later, A arrives at point B, and B arrives at point C. Then A and B turn around and walk back at the same time. After that, how long will it take for A and B to meet? At this time, how many meters are A and B from A respectively?

14. The main staircase of the shopping center lobby is shown in Figure 3. There are 1 floor to floor 2 * * 15 steps, each step is 16 cm high, each step is 26 cm deep, and the known staircase is 3 meters wide. 1 If you want to lay a carpet for every square meter in 80 yuan on the stairs from the first floor to the second floor, you need to buy it.

15, two shopping malls, A and B, launched preferential activities to welcome the New Year. Mall A stipulates: "Every 200 yuan is reduced by 10 1 yuan." Mall B stipulates: "Every full 10 1 minus 50 yuan." Xiaoming's father took a fancy to a pair of 699 yuan sports shoes and a 9 10 sweater. These two kinds of goods are sold in both shopping malls. Q: How can I get a cheaper one? * * * How much? Please provide a justification for the answer.

16. In an archery competition, four concentric rings were drawn on the target. As shown in Figure 4, the number in each ring is the score you can get by hitting this ring. Athlete Huang Liang shot 10 arrows, and each ring was hit by an arrow. * * * got 1 10. Q: How many arrows were shot in each ring?

Well, you see, I tried my best to find the answer for you, at least give me some points! Hmm? )