Unit 1: Graphic Transformation

A figure can be divided into symmetry axes. By understanding the rotation of the figure and the translation or up-and-down movement of the figure, we can learn the main contents of this unit.

Unit 2: Factors and Multiplies

Very simple, such as: 3×4= 12, where 3 and 4 are factors of 12, and 12 is a multiple of 3 and 4; The multiple of 2 is 0, 2, 4, 6, 8; The sum of multiples of 3 is multiples of 3; The multiple of 5 is 0 or 5. Also, to grasp the characteristics of exponent and composite number, a prime number is a number with only 1 and its own two factors (also called "prime numbers"), such as 2, 3, 5 and 7. The composite number is 1 and a factor other than itself. For example: 4,6,15,49.

Unit 3: Long Hairs and Cubes

Main content: A cuboid has 6 faces, almost all of which are cuboids (at most two faces are cuboids). A cuboid has 12 sides and 8 vertices.

All six sides of the cube are equal, and all 12 sides of the cube are equal. The surface area of the cube is: side length × side length × 6; A cuboid is (length× width+length× height+width× height) × 2, or length× width× 2+length× height× 2+width× height× 2.