Knowledge points of "understanding RMB" in senior one mathematics.
1. The units of RMB are (yuan), (angle) and (minute).
2. Conversion between RMB units:
1 yuan = 10 angle; 10 angle = 1 yuan; 1 angle = 10 point; 10 point = 1 angle; 10 angle = 100 point; 1 yuan = 100 integral.
3. Main problems:
Fill in the appropriate units. (Pay attention to the actual connection with life)
Calculation: yuan+yuan angle+angle exceeds 10, remember to change it to 1 yuan.
Meta-meta angle-The angle "angle" is not enough to be reduced to "meta" and then calculated by borrowing 1 meta as 10 angle.
4, problem solving: first draw the batch, find the correct data, and then calculate the formula.
The presentation form is "several yuan and several jiao+several yuan and several jiao", not decimal presentation.
5. Change money: 1 block. 10 yuan can get 5 pieces of 2 yuan.
1 block 100 yuan can be exchanged for 5 pieces of 20 yuan. 1, 100 yuan can be exchanged for 2 50 yuan.
1 50 yuan convertible 10 5 yuan.
6, 2.00 yuan =2 yuan; 0.50 yuan =5 cents; 59.90 yuan =59 yuan 9 jiao; 9.25 yuan = 2.5 points for 9 yuan.
Knowledge points of "understanding graphics" in senior one mathematics
A, graphics can be divided into (1) plane graphics; (2) Three-dimensional graphics
1. Plane graphics: square, rectangle, triangle, circle, parallelogram.
2, three-dimensional graphics: cuboid, cube, cylinder, sphere.
Second, the combination of graphics.
1, two identical triangles can be combined into a parallelogram; Two identical triangles can be combined into a parallelogram, a rectangle or a large triangle.
2. It takes at least 4 small cubes to form a big cube, and at least 8 small cubes to form a big cube.
3. Two rectangles can form a big rectangle. (Two special rectangles can form a big square), and four cuboids can form a big cuboid.
learning process
1. Teachers lead students to recall the characteristics of three-dimensional graphics.
2. Play the micro video to the students.
(Courseware shows cuboid, cube, cylinder, sphere and triangular prism, and plays the process of "unfolding" plane graphics from three-dimensional graphics)
3. Organize students to draw, draw, print and unfold plane graphics in the exercise book by using learning tools with different shapes prepared before class. Students who draw well and quickly can share his works with Mr. Mai.
4. Know rectangle, square, circle and triangle.
5. Know the parallelogram (guide students to observe the parallelogram composed of two identical triangles)
Teacher: Can you fold a square, rectangle or parallelogram paper into the same two parts? How many folding methods are there? Who wants to tell us how they are folded? What graphics are folded out? Please do it yourself. Students who are prepared can even join Mr. Mai.
6, finishing
(1) courseware presents multiple graphics. Ask the students to tell their parents what each number is.
(2) Say: How do you remember what each figure looks like?
Methods and Skills of Mathematics Learning in Grade One
(A) with "add up to ten" oral calculation
According to the characteristics of the formula, apply laws and properties to "round" the operation data:
1. Appendix "Overview"
For example, 14+5+6=? Enlighten students: Add up several figures. If several numbers add up to an integer 10, you can change the position of the addend and add up several numbers.
2. Use the nature of subtraction to "round off"
For example, 50- 13-7 can inspire students to say the thinking process, say several oral calculation methods and let students sum up by comparison: subtract several numbers from a number continuously. If the sum of subtraction can make up an integer, you can add the subtraction first and then subtract it. This kind of oral calculation is simple and convenient.
3. Multiplication factor "rounding"
Such as 25× 1? The product of 4× 4, 25 and 4 is 100, and the result can be calculated directly by mouth.
(B) the use of "decomposition" oral calculation
Is to "disassemble" one number in the question and perform an operation with another number, such as 2? 5×32, the original formula becomes 2? 5×4×8= 10×8=80。
(C) using some quick calculation skills for oral calculation
1. Two digits are quickly multiplied by the first and last digits 10.
That is, multiply the number on one of the ten digits by 1, and the product is one hundredth and one thousandth of the product of two numbers, and then the product of the numbers on two numbers is one and one tenth of the product of two numbers. For example, 14× 16=224(4×6=24 is a unit, 10 digits, (1+ 1)× 1=2 is a hundred digits).
2. Fast multiplication of two digits of head difference 1 and tail difference 10. That is to say, the square of the ten digits of the larger factor MINUS the square of its single digits. Such as: 48×52=2500-4=2496.
3. Use the "benchmark number" for quick calculation.
For example, 623+595+602+600+588 can choose 600 as the base number, first accumulate the difference between each number and the reference number, and then add the product of the base number and the number of items.
(d) Memorizing commonly used data
Such as: 65438+ the square of 0 ~ 20 of each natural number; To read the word "practice" well means to practice oral arithmetic often. The formation of speech ability can only be achieved through routine training, and the training should be diversified.
Articles related to important knowledge points in the second volume of senior one mathematics;
★ Knowledge points of the second volume of mathematics in the first grade of primary school
★ The first grade mathematics knowledge points Volume II
★ Summary of Mathematics Knowledge Points in Volume II of Senior One of People's Education Edition (2)
★ People's Education Edition, Grade One, Volume Two, Mathematical Knowledge Points Induction
★ Summary of compulsory knowledge points in first grade mathematics.
★ One-year Mathematics Knowledge Point People's Education Edition
★ Sort out and summarize the knowledge points of first-grade mathematics.
★ Organize the knowledge points of mathematics in the first grade of primary school.
★ Primary school first grade mathematics test center
★ Make up the knowledge points of mathematics in the second volume of Grade One.