(1) The necessity of unifying length units (understand)

(2) Recognize centimeters and use "centimeter" as the unit to measure the length of objects (master the application)

(3) Understand meters and the relationship between meters and centimeters (master)

(4)Solve problems

(1) Characteristics and measurement of line segments (mastery)

(2) Draw line segments (master the application)

(3)Solve problems

(1) How to choose the unit of length (master the application)

(2)Solve problems

1. Addition without carry (master the application)

⒉.Carry addition (master the application)

1. Subtraction without abdication (master the application)

⒉. Abdication and subtraction (master the application)

3. Solve the problem

(1) Calculation method of continuous addition (master the application)

(2) Calculation method of continuous subtraction (master the application)

(3) Operation order of mixed operations of addition and subtraction (master the application)

(1) Awareness corner (mastery)

(2) Draw corners (master and use)

(3) Solve the problem---number of angles problem

(1) Understand right angles (master)

(2) How to draw a right angle with a triangle ruler (master the application)

(3) Recognize acute and obtuse angles (master)

(4) Use a set of triangle rulers to create an obtuse angle (master the application)

(1)The meaning of multiplication

(2) Names of each part of multiplication

(1) Multiplication table of 2,3,4

(2) Multiplication table of 5

(3) Multiplication table of 6

Pay attention to the difference between formulas and calculations

(1) Multiply and add

(2) Multiplication and subtraction

Pay attention to the order of operations: multiplication first, addition and subtraction later

(1) Calculate the sum of several numbers by multiplication

(2) Find the sum of a few and a few using addition.

Grasp the basic characteristics of the observed object to make judgments

Three-dimensional graphics

The answer is not just -, there may be many

Use your hands to quickly memorize multiplication tables:

information transformation

Multiple ways to solve

(1) One hour when the hour hand moves one step

(2) The minute hand moves 1 small space is 1 point, and the minute hand moves 1 large space is 5 points.

(3) Starting from the number 1, 5 minutes and 5 points, the number of minutes can be determined

(4) The minute hand moves once, and the hour hand moves one step, 1 hour = 60 minutes

(1) Text representation

(2) Electronic timing

(1) Elimination method

(2) Reasoning method

(1) If the order of arrangement is different, the composed numbers will be different.

(2) During the arrangement process, care must be taken not to repeat or omit

(1) Combination problems have nothing to do with order.

(2) Summation is a combination problem, and group number is a permutation problem.