The second grade mathematics length unit exercises knowledge points.
First, calculate the following questions.
(1) 4cm+35cm = ()
(2) 90cm-55cm = ()
(3) 37m+40m =()
(4)100m-38m = ()
Fill in the blanks.
(1) 33cm-10/0cm = () cm
(2) () cm +9 cm =39 cm
(3) () cm -5 cm =38 cm
Third, judge (the right picture is "tick" and the wrong picture is "X").
Your bed is 3 meters long. ()
The height of the ink bottle is 5 meters. ()
③ Xiaohong's height is 150 cm, which is actually 1.50 cm. ()
④ The height of a building 1 1 m. ()
Fill in the blanks.
40 cm +60 cm = ()
Cm 15cm+5cm = () cm
Fifth, the judge.
(1) None of the four sides of the classroom wall are line segments. ()
(2) On a straight line, the line segment between two points is a line segment. ()
(3) The length of the line segment cannot be measured. ()
6. Fill in the appropriate length unit in the brackets.
Pencil length 18 ()
A big tree is 10 ()
Paper clip length 3 ()
There are 2 beds for children ()
Knowledge points of mathematical division in the second volume of senior two.
1, division of knowledge points in the table:
(1) Understand the meaning of average score. A simple division is calculated according to the multiplication in the table.
(2) The quotient can be obtained by multiplication formula.
(3) According to the meaning of multiplication and division, solve some simple application problems of multiplication and division.
(4) Divider Divider = quotient divisor = divisor × quotient = dividend
2. Division: It is one of the four operations. The operation of finding the other factor by knowing the product of two factors and one of them is called division.
3. The nature of division
A number divided by several numbers in succession is equal to the product of this number divided by those numbers. This is the nature of division. Sometimes simple operations can be performed according to the nature of the division. Such as: 300÷25÷4=300÷(25×4)
4. Division formula
(1) frequency divider = quotient
(2) Dividend quotient = divisor
(3) divisor × quotient = dividend
5. Dividends
A number divided by another number in a division operation, such as 24÷8=3, where 24 is the dividend.
6. Divider: In the division formula, the number after the divisor is called the divisor.
Example: 8÷2=4, then 2 is the divisor. Eight is dividends. The divisor cannot be 0, otherwise it is meaningless.
7. Quotient: In a division formula, dividend/divisor = quotient+remainder, and then it is deduced that quotient × divisor+remainder = dividend.
8. Quanshang
When the number A is divided by the number B (non-zero), its quotient is called complete quotient. For example, 9÷3=3, and 3 is the complete quotient.
9. Incomplete quotient
If the number A is divided by the number B (non-zero), the quotient obtained is incomplete. For example: 10 ÷ 3 = 3... 1, where 3 is an incomplete quotient.
10, the relationship between dividend and quotient
Dividend is enlarged (reduced) by n times, and quotient is correspondingly enlarged (reduced) by n times.
The divisor is expanded (reduced) by n times, and the quotient is correspondingly reduced (expanded) by n times.
Mathematics learning methods and skills
1, the habit of careful observation. By carefully observing the situation diagram and operation process in class, we can develop the habit of paying attention to the things around us.
2. The habit of asking questions. Teachers should guide students not to be ashamed to ask questions, and praise those students who dare and are good at asking questions at any time. Teachers should answer students' questions patiently. Give students the right to ask questions in class.
3. The habit of thinking from multiple angles. When encountering problems, do not think from one angle, but explore the answers from multiple angles to encourage students' innovative thinking and innovative thinking.
4. The habit of being good at association, conjecture and hypothesis. When there is no way to start with a question, you can make a bold guess, assume the answer, and then reason forward. This method can be used especially when doing difficult problems.
If students form these good habits, their thinking flexibility will be greatly improved, and their understanding ability will also rise.
Sort out the related articles about the knowledge points of mathematics in grade two;
★ Second grade version of mathematics knowledge points
★ Guidance of mathematics learning methods in the second grade of primary school
★ Guidance on learning methods in the second grade of primary school
★ Best learning method guidance and knowledge point summary
★ Guidance and summary of learning methods in senior two.
★ Some edited versions of the second grade Chinese knowledge points are combed.
★ Guidance on primary school learning methods
★ The knowledge points of Chinese units in grade two are compiled by the Ministry.