1. On one side of an 80-meter-long road, plant a tree every 4 meters from beginning to end. How many trees does a * * * need to plant?

2.22 bus runs every five minutes. It takes Xiaoming 40 minutes from home to school. How many number 22 buses can Xiao Ming meet on the bus? (16 cars)

When a shop is doing activities, every four empty bottles can be exchanged for a drink. Xiaoming now has 15 empty bottles. How many bottles of water can he drink at most? (5 bottles)

A snail climbs a tree ten meters high, three meters during the day and two meters at night. How many days does it take to climb to the top of the tree? (8 days)

Xiaoming's mother can bake two cakes in the pan, and it takes five minutes to bake one side of the cake. How long does it take to bake seven cakes? Excuse me: Is the student's answer correct? Why? (It should be 35 minutes. The first three pots are branded and brought out; The fourth pot, one branded on one side and the other branded on the other side; Pots 5, 6 and 7 are branded on the other side. A ***7 pots, each pot for 5 minutes, * * * 35 minutes. )

6. There are colorful flags beside the playground. The order of colored flags is: green, yellow, pink, red, green, yellow, pink, red ... Can you guess what color the 34th flag is?

7. In a store's preferential activities, MSG 1 package is sold to 7 yuan, 2 packages are sold to 13 yuan, 3 packages are sold to 17 yuan, and how much is it for 4 packages? How much is eight packs?

8. Fill in the same natural number in □, make the calculation result of (28 +□) ÷ (□-22) the maximum and minimum natural numbers, and find the maximum and minimum natural numbers.

9. As shown in Figure ∠2 = 30, the sum of degrees of all angles is 300. Find the sum of degrees of ∠ 1, ∠ 2 and ∠3.

10. There are three classes A, B and C in the fourth grade of a school. Students in Class A and Class B 100, students in Class B and Class C10/0/person, 97 students in Class A and Class C, how many students are there in Class A, Class B and Class C?

1 1. According to the rules shown below, build a small cube with a side length of 1cm into a geometry. How many small cubes are there in the geometry built for the seventh time?

12. Cut a corner from a piece of paper with 2005 faces along a straight line. What are the remaining angles?

13, the base angle of an isosceles triangle is 30, so this triangle is a () triangle. If the vertex angle is 30, then this triangle is () triangle.

14. A tourist is walking on the road at the same speed. It takes him 11second to get out of the tree (the distance between every two trees is equal). Which tree should he walk to in 22 seconds?

15. Arrange four squares with side lengths of 5cm, 4cm, 3cm and 2cm in a row, as shown in the figure. What is the circumference of this figure?

16. Someone has 13 playing cards. The status of these cards is as follows:

(1), there is no king or Xiao Wang, but there are four colors of hearts, spades, diamonds and clubs;

(2) The number of cards of different colors is different;

(3) There are five hearts and squares together;

(4) There are 6 hearts and spades;

(5) There are only two cards of the same suit. Q: How many clubs are there at most?

17. The math contest * * has 10 questions. If you do it right, you will get 10, and if you do it wrong, you will get 5 points. It is understood that Xiao Ming got 70 points in this competition. How many questions did he answer correctly?