Knowledge points in the second volume of the second grade of primary school (mathematics)
The first single metadata collection and collation
1. Collect data by orthography.
2. Use statistical charts to represent data.
3, according to the statistical chart can make some judgments.
4, data collection-sorting-analysis table.
The second unit division table (1)
I. Average score
1, the meaning of average score: divide some projects into several parts, and each part gets the same amount, which is called average score.
2, the average method:
(1) When some articles are divided equally according to the prescribed number of copies, they can be divided into one article or several times until all the articles are finished.
(2) Divide some items into several equal parts. Think about time-sharing: this number can be divided into several such parts.
Second, division.
1. Meaning of the division formula: As long as it is the process of average division, it can be expressed by the division formula.
2. How to read the division formula: usually read from front to back, read as division, = read as arithmetic, and other readings remain unchanged.
3. Name of each part of the division formula: In the division formula, the number before the division sign is the dividend, the number after the division sign is the divisor, and the number obtained is the quotient.
Third, use the multiplication formula of 2~6 to find the quotient.
1, the method of quotient:
(1) Find the quotient by the average score method.
(2) Use the multiplication formula to find the quotient.
(3) Use the multiplication formula to find the quotient.
2. When you use the multiplication formula to find the quotient, you should multiply the dividend of the divisor.
Fourth, solve the problem.
1, the solution to the average score problem:
Total number of shares per share = number of shares, total number of shares = number of shares, dividend = quotient dividend,
Dividend = quotient divisor+remainder, divisor = dividend quotient, factor factor = product,
One factor = the product of another factor.
2, with two steps to solve practical problems:
(1) The problem to be solved requires finding the total number and calculating by multiplication;
(2) Required questions require finding out the number of copies or the number of copies per copy, and calculating by division.
Knowledge points of second grade mathematics
Knowledge points to know the time:
1, 1 =(60) points.
2. The number upstream of the clock face (12), which divides the clock face into (12) equal grids, and each grid is divided into (5) equal grids, and there are (60) small grids on the clock face.
There are (2) hands on the clock face. The shorter needle is called (hour) needle, and the longer needle is called (minute) needle. When the minute hand walks at 1, it is (1) minutes, when the big hand walks at 1, it is (5 minutes), and when the hour hand walks at 1, it is (1). Minute hand from 12 to 6, go (30 points); The clockwise clock went from 12 to 6, and walked for (6) hours; Clockwise hand made a circle from 12, then returned to 12 and left (12).
4. (30) minutes can also be said to be half an hour, and (15) minutes can also be said to be a quarter of an hour. For example, 8: 30 is 8: 30, and 9: 00 15 is 9: 15.
At 5 o'clock (3 o'clock or 9 o'clock), the hour hand and the minute hand on the clock face are at right angles.
6. Write down the time on the clock face and draw the minute hand: the third question of the textbook is P 10 1, and the sixth question is P 105.
Mathematics wide-angle knowledge points:
1, when arranging combinations, according to a certain order, so as to avoid duplication or omission. Arrangement is related to order, such as the composition of numbers, the collocation of clothes and trousers, breakfast, queuing and so on. Combination has nothing to do with order, such as digital summation, handshake, juice mixing, etc.
2, 3 people, every two people play a game or shake hands and take pictures. * * * to 3 times.
3. Three nonzero numbers can form six tens and two digits with different digits, such as 4, 5 and 7 can form 45, 47, 54, 57, 74 and 75; If one is 0, it can form four two-digit numbers. For example, 0, 4 and 7 can form 40, 47, 70 and 74.
Second grade knowledge point mathematics
Summary of knowledge points:
1. unit of length: the unit of length refers to the basic unit for measuring spatial distance, which is formulated by human beings to standardize the length.
Its international unit is "meter" (m), and commonly used units are millimeter (mm), centimeter (cm), decimeter (dm), kilometer (km) and so on. Length units play an important role in various fields.
Meter: The standard unit of length in the international system of units is "meter", which is represented by the symbol "m".
Decimeter: dm is one of the metric units of length, and 1 decimeter is equivalent to one tenth of 1 meter.
Centimeter: unit of length, abbreviated as centimeter.
Millimeter: English abbreviation for mm
(1 cm = 10/0mm =0. 1 decimeter =0.0 1 m =0.0000 1 km)
2. Carry: In addition, when each digit is equal to the radix, move forward by one digit.
For example, if the number of digits reaches 10, the number will move forward by 1 to become a ten.
In the decimal algorithm, if every digit is full ten, add1to the decimal digit; When there are ten people to ten, add one to a hundred.
3. subtraction without abdication: subtraction without high position. Example: 56-22=34, 6 can subtract 2, so there is no need to borrow from the top 5.
4. abdication subtraction: the subtraction operation that must borrow from the high position. For example: 5 1-22=39
1 cannot be reduced by 2, but must be borrowed from Gao 5.
5. Continuous addition: The continuous addition of multiple numbers is called continuous addition. For example: 28+24+23=85
6. Continuous subtraction: The continuous subtraction of multiple numbers is called continuous subtraction. For example: 85-40-26= 19
7. Addition and subtraction: there are both addition and subtraction operations in the operation. For example: 67-25+28=70
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