(1) Further understand and master the meaning of average score in the theme map.

(2) Feel the necessity of learning fractions and the superiority of mathematical symbols in specific situations, and understand the meaning of fractions.

(3) Combining with specific operations, understanding and mastering the meaning, writing method and reading method of a score can complete the size comparison of a score (the whole 1 must be the same).

(4) Combined with specific operations, understand and master the meaning, writing and reading of fractions, and be able to compare fractions with denominators (integer 1 must be the same).

(4) Know what a number is a fraction, be able to point out the names of all parts of the fraction, and express simple fractions by origami, coloring and other methods.

2. Simple calculation of score:

(1) Understand the significance of fractional addition and subtraction in specific situations, use charts to understand and master the arithmetic and algorithm of fractional addition and subtraction with the same denominator, and be able to calculate skillfully and correctly.

(2) Understand and master the addition and subtraction of fractions with the same denominator whose sum is 1 or whose subtrahend is 1, and be proficient in correct calculation.

(3) can solve related practical problems, improve the ability to analyze and solve problems, and appreciate the value of mathematics.