Textbook Analysis 1, Textbook Number and Algebra Analysis (1) Unit 1 "Multiples and Factors" is mainly about the understanding of the characteristics of natural numbers, multiples and factors, multiples of 2, 5 and 3, prime numbers and composite numbers, and odd numbers and even numbers. (2) The third unit "Fraction" mainly studies the meaning of fractions. It can recognize, read and write simple fractions, add and subtract simple fractions with the same denominator, express things with fractions, and solve some simple practical problems. (3) The fourth unit, Fraction addition and subtraction, mainly studies the addition and subtraction of fractions with different denominators and their practical application, the mixed operation of fractions, and the mutual transformation between fractions and decimals. The second unit of space and graphics (1), "the area of graphics (1)", mainly studies the comparison of the size of plane graphics, the understanding of the base and height of parallelogram, triangle and trapezoid, and the related area calculation. (2) Unit 5 "Area of Graphics (2)", mainly learning the area calculation of combined graphics and some interesting simple irregular graphics. The sixth unit of Statistics and Probability, "The size of possibility", mainly focuses on learning to express the size of possibility with scores, and using the knowledge learned to design schemes.