The knowledge points are summarized as follows:

A preliminary understanding of 1 and scores;

(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.

3. Features:

1. When the same small square is used to form a rectangle or a square, the closer (or equal) the length and width of the figure, the maximum circumference.

2. Features of quadrilateral: It has four straight sides and four corners.

3. The characteristics of a rectangle: the opposite sides are equal and there are four right angles.

4. Features of a square: all four sides are equal and there are four right angles.

4, the meaning of decimal and reading and writing:

Know decimals and read and write decimals.

Decimals consist of integer parts, decimal points and decimal parts. The point in the middle is the decimal point, the integer part on the left and the decimal part on the right.

The integer part of the decimal is read as an integer, the integer part of 0 is read as a zero, and the decimal part is read as a "dot". The numbers on each number are read from left to right, even if there are one or several zeros, they should be read one by one.

When writing decimals, write the integer part first, and write by integer writing; Then put the decimal point in the lower right corner of the unit; Finally, write the decimal part and write the numbers on each digit in turn.