3/4+5/6 = 19/ 122/3- 1/4 = 5/ 124/5+ 1 1/ 15+3/65438.

1/2+2/3 = 7/66-(3/4-2/5) = 5 and 13/20.

There are more than 70 preserved eggs in the food store. If you put them in four egg trays in succession, it's just finished. If you put it in a row of six egg trays, it's finished. Can you find out how many preserved eggs there are?

8. There are many kinds of coal resources in China, and the specific composition is shown in the left figure.

(1) What percentage of lignite accounts for the total coal?

(2) What questions can I ask?

9.

8 1 cm3 =-ml 700 dm3 =-m3 560ml =-L 2.3 dm3 =-cm3

10. A rectangular iron sheet (as shown on the right) is cut into a square with a side length of 5cm from each of the four corners, and then made into a box. How much iron is used in this box? What is its volume?

1 1. Draw the figure "The kite has been translated or rotated" (only the outline is drawn).

12. A cuboid glass tank with a length of 8dm, a width of 6dm, a height of 4dm and a water depth of 2.8dm, if a cube iron block with a length of 4dm is put in, how much water will overflow in the tank?

13. The following is the average score (unit: seconds) of two classes in Grade Five 12 athletes in 50m sprint training.

Category I: 8.8.28.48.58.68.48.38.18.38.58.68.7.

Category II: 8.58.38.48.58.38.48.38.48.58.48.48.4

(1) What are the average, median and mode of these two sets of data?

(2) Which figure do you think is more suitable to represent the results of the two classes? If these two classes have a 50-meter round-trip relay race, which class do you think is more likely to win?