Curiosity and mystery are closely linked, and the mathematical world is magical.
4, addition, subtraction, multiplication and division, points, lines and surfaces, the mystery is endless; Eyes, ears, hands and brains, calculate and spell, and show their magical powers.
5. Open the door of mathematics and explore its mystery.
6. Addition, subtraction, multiplication and division of good friends are good helpers in life.
7. Mathematics is full of mystery, and exploration is enjoyment.
8. Add happiness, reduce troubles, multiply, multiply and divide, and time algebra; Integral happiness, differential difficulty, straight happiness, life geometry.
9. Add, subtract, multiply and divide, and cross the door of life; Point, line and surface, deduce the fun of life.
10, number, one, two, three, four, five; Learn to add, subtract, multiply and divide.