Fractional addition and subtraction

1. 1 origami 2

1.2 Sunday arrangement 5

1.3 "fractional kingdom" and "decimal kingdom" 7

1.4 exercise 1 9

Two cuboids (1)

2. 1 Understanding of cuboids 1 1

2.2 unfolding and folding 14

2.3 The surface area of a cuboid is 16.

2.4 exposed surface 18

2.5 Exercise 2 20

Three-fraction multiplication

3. 1 fractional multiplication (1) 22

3.2 Fractional Multiplication (2) 25

3.3 Fractional Multiplication (3) 28

3.4 Countdown 3 1

3.5 Exercise 3 33

Four cuboids (2)

4. 1 volume and 36 volumes

4.2 unit of volume 38

4.3 cuboid volume 4 1

4.4 unit of volume's transformation 44

4.5 Interesting measurement 46

Exercise 4 48

Finish and review 50

Integrating applications 52

Five-fraction division

5. 1 fractional division (1) 55

5.2 Fractional Division (2) 57

5.3 Fractional Division (3) 60

Exercise 5 63

Step 6 determine the location

Determine the location 1 65

6.2 Determine the position 2 67

Solve problems with equations

7. 1 number of stamps 69

7.2 Problems encountered 7 1

Exercise 6 73

Math is very interesting.

"Symbolic" long-distance running 75

Interesting fold 78

Packaging knowledge 80

Representation and analysis of data

8. 1 comprehensive bar chart 82

8.2 Composite Broken Line Statistics Chart 84

8.3 Re-understanding of the average value 87

Exercise 7 89

General review 92