[Knowledge points in this unit]: 1, integer is divided by one digit; 2, there is a division of 0 in the middle of the quotient; 3. Division with 0 at the end of quotient; 4. Simple application. 1 [Memory] When three digits are divided by one digit, the quotient may be two digits or three digits. (The quotient is three when hundreds are divided enough, and two when hundreds are not divided enough. ) There is a division of 0 in the quotient of 2 [memory]. (Quotient 0 when ten digits are not divisible enough) 3 [Memory] 0 times any number equals 0. 0 divided by any number that is not 0 equals 0. 4 [continued application questions]. 5 [sale at half price] (original price ÷2= current price) 6. Memory relationship: total number of chickens ÷ number of floors = total number of books per floor ÷ number of shelves = total number of books per shelf ÷ number of batteries per box = number of boxes × time = distance ÷ time. 2. Calculate the number of days that have passed; 3. Happy birthday 1 [Memory] Years are divided into normal years and leap years; Month is divided into big month, small month and special February. There are 365 days in a normal year and 366 days in a leap year. (The big months are: 65438+ 10, March, May, July, August, 65438+ 10, 65438+February (7); Abortions are: April, June, September, 165438+ October) (4) February in a normal year has 28 days, and February in a leap year has 29 days. There are July and August in succession, or 65438+February and 65438+ 10 month. The number of days in two consecutive months is 6 1 day, one of which is a big month and the other is a small month. A normal year, second quarter 1, fourth quarter 3, first half 909 19292, second half 1 8, fourth quarter 184, second quarter days, third quarter days, fourth quarter19. August Army Day 1, July Party Day 1, June National Day 10, September Teacher's Day 10 and so on. 6. Usually there are three normal years and 1 leap year every four years. The Gregorian calendar year is a multiple of 4, usually a leap year. Gregorian calendar year is an integer, and it must be a multiple of 400 to be a leap year (AD 800, 1200, 1600, 2000, 2400, etc. Memory: People's Republic of China (PRC) was founded in 1949, 10, 1, and 2008 will be the 59th anniversary. (2008- 1949=59)8. Calculate the number of days [by month] For example, how many days are there from June 12 to August 17? June, July and August, thinking 12-30, 3 1- 17, 30-12+1=19,3/kloc-0. The movement of a pendulum is rotation. Unit 4 Multiplication [knowledge points in this unit] 1, two digits multiplied by integer ten, two digits multiplied by two digits to calculate three digits multiplied by two digits to estimate. 4. apply. [Memory] 1, the product of two digits multiplied by two digits may be three digits or four digits. 2. Check the calculation: swap the positions of the two multipliers. ★ multiplication application problem. Question 6 on page 38, question 4 on page 39 and so on. Quantity relationship: number of milk bottles per box × number of boxes = number of milk bottles × quantity = total price unit 5 Observation object (omitted) unit 6km and ton 1, length unit: mm, cm, decimeter, meter, kilometer rate: 1km = 1000m Quantity formula: runway roll. Large units are converted into small units (multiplied by the propulsion rate between them), and small units are converted into large units (divided by the propulsion rate between them). The seventh unit is an axisymmetric figure 1, and the figure that completely overlaps the left and right sides after being folded in half is an axisymmetric figure. 2. Common axisymmetric figures are: rectangle, square, circle and equilateral triangle. 3. The letters are axisymmetric figures: A, B, C, D, E, H, I, K, M, O, T, V, U, W, X, Y.4. Draw the other half according to one half of the axisymmetric figure. Unit 8 cognitive score 1, unit "1"-one object or several objects 2. Score: divide an object or several objects into several parts, which means 1 or several parts. 3. Addition and subtraction of fractions with the same denominator. (The denominator remains the same, and the numerator is added and subtracted. ) 4. Total number ÷ denominator × numerator = number taken out. For example, what are three fifths of 90 peaches? 5, the numerator is the same, and the score with small denominator is large. The denominator is the same, and the fraction with large numerator is large. 6. Class 3 (1) has 20 boys and 25 girls. The number of boys accounts for the number of girls and the number of boys accounts for the number of students in the class. Unit 9 The area of rectangle and square is 1. Formula: (see table) 2. A square with a side length of 1 cm has an area of 1 cm 2. A square with a side length of 1 decimeter and an area of 1 square decimeter; A square with a side length of 1 m and an area of 1 m2. Rectangular square area length× width = area side length× side length = area perimeter (length+width )× 2 = perimeter side length× 4 = perimeter side area ÷ length = wide area ÷ width = long perimeter ÷2- length = wide perimeter ÷2- width = long perimeter ÷4= side. Large units are converted into small units (multiplied by the forward speed between them) and small units are converted into large units (divided by the forward speed between them) 5. ★86 pages of thinking questions (hands-on points) 6. The area of Figure A is larger than that of Figure B, but their perimeters are equal. 7. The units of length unit and area unit are different and cannot be compared. 8. Make a rectangle with 20 sticks. What is its circumference and area? Make a rectangle with 20 small squares, and the side length is 1 cm. What is its circumference and area? (The two situations are different) Unit 10 Statistics 1, the method of finding the average: 1, moving more and making up less 2, total number of people (copies) = average 2, changes in exercise and body. After exercise, people's pulse will accelerate. After a few minutes' rest, it will return to normal. Unit 1 1 Understanding decimals 1 and tenths are equal to tenths. 2. How to read and write decimals? 3. Comparison of decimal size. 4. Addition and subtraction of decimals. 5,0 is both a natural number and an integer. 6. Decimals are not necessarily smaller than integers.