1, the length of the blackboard is 300 () and the height of a big tree is 12 ().

2. A building is 48 () high and a pencil is 18 () long.

3. The length of the straight track on the playground is 100 ()

4, the length of a tube is 60 ()

5.200 cm () 2m 1 00cm () 1 0m/cm ()1m2 ()150cm.

35cm+6cm () 40cm

6. There are 28 gray pigeons, 12 black pigeons are less than gray pigeons, and 26 white pigeons are more than gray pigeons. May I ask two questions?

There are 26 boys in our class, 12 girls are less than boys. Ask and answer math questions.

8. Toy car 32 yuan, pencil case 16 yuan. How much are two things?

9. A corner has () vertices and () edges.

10, in a rectangle, there are () angles and () right angles.

1 1, a rectangular piece of paper, minus a right angle, the result may be () angles.

12, the angle size () on each side of a cuboid and cube is () angle, and a * * * has () right angles.

13,2m () 20cm10m ()100cm

14, one meter is () cm.

15, connecting two points, can draw () line segment.

17. There are 27 trucks in the parking lot, 8 buses are less than trucks, and 6 cars are more than trucks. What questions can I ask? Column calculation.

18, Basketball 55 yuan, Football 46 yuan, Volleyball 38 yuan, (1) How much is basketball more expensive than football?

(2) How much is football cheaper than basketball?

(3) What two kinds of balls can I buy for100 yuan?

19, there were 64 students in the school choir, 7 students graduated, and 15 students joined. How many people are there in the school choir now?

20. Xiao Fang went to the movies with his parents and grandparents and bought a ticket for 5 yuan.

(1) How much are three tickets? How about four o'clock?

(2) Is it enough for Xiao Fang to spend 30 yuan to buy five?

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