Judging from the mathematics learning psychology of primary school students, the learning process of students is not a passive absorption process, but a reconstruction process based on existing knowledge and experience. Therefore, learning while doing and learning while playing will make children learn more actively. The following is the calculation unit and rate classification of mathematical quantities I have compiled. I hope everyone will look carefully!
unit of measure
1, length measurement unit and rate:
Kilometers (kilometers), meters, decimeters, centimeters and millimeters.
1 km = 1 km 1 km = 1000 m
1 m = 10 decimeter 1 decimeter = 10 cm
1 cm = 10/0mm
2. Unit of measurement and rate of area:
Square kilometers, hectares, square meters, square decimeters, square centimeters
1 km2 = 100 hectare
1 km2 = 1000000 m2
1 ha = 1 10,000 m2
1 m2 = 100 square decimeter
1 square decimeter = 100 square centimeter
3. Volume measurement unit and rate:
Cubic meters, decimeters, centimeters, liters and milliliters.
1 m3 = 1000 cubic decimeter
1 cubic decimeter = 1000 cubic centimeter
1 cubic decimeter = 1 liter 1 cubic centimeter = 1 ml.
4, quality unit and grade:
Ton, kilogram, kilogram, gram
1 ton = 1000 kg
1 kg = 1 kg
1 kg =1000g
5. Time unit and rate:
Century, year, month, day, hour, minute and second.
1 century = 100 1 year =65438+ February.
1 day =24 hours 1 hour =60 minutes
1 min =60 seconds
(The months of 3 1 day are 1, 3, 5, 7, 8, 10, 65438+February, and the months of 30 days are April, June and September,165438+/kloc-0.
Common calculation formula table
1, rectangular area
= length × width, and the calculation formula is S=ab.
2. Square area
= side length × side length, and the calculation formula is S=a×a=a2.
3, rectangular perimeter
= (length+width) ×2, and the calculation formula is C=(a+b)×2.
4. Square perimeter
= side length ×4, calculation formula C=4a.
5, parallelogram area
= bottom × height, and the calculation formula is S=ah.
6. Triangle area
= bottom× height ÷2, and the calculation formula is S=a×h÷2.
7. Trapezoidal region
= (upper bottom+lower bottom) × height ÷2, and the calculation formula is S=(a+b)×h÷2.
8. cuboid volume
= length × width × height, and the calculation formula is V=abh.
9, the area of the circle
= pi× radius square, and the calculation formula is V=πr2.
10, cube volume
= side length × side length× side length, and the calculation formula is V=a3.
1 1, cuboid and cube volumes
= bottom area × height, and the calculation formula is V=sh.
12, the volume of the cylinder
= bottom area × height, and the calculation formula is V=sh.
Expand:
Teaching plan design of "area unit propulsion rate"
Teaching objectives:
1. After exploring the area unit rate, remember that 1 square meter = 100 square decimeter, 1 square decimeter = 100 square centimeter. A simple conversion of area units will be performed.
2. Develop the concept of space and cultivate thinking ability and interest in learning.
Teaching process:
First, check the import:
We already know the area and the area unit. Do you know what area units there are?
Which is the biggest and which is the smallest? Can you compare their sizes? So how many square decimeters is 1 square meter, and how many square centimeters is 1 square decimeter? Today we will study this problem. Write on the blackboard.
Second, learn new knowledge.
1. Explore 1 square decimeter equals 100 square centimeter.
Take out a square with a side length of 1 decimeter and ask what its area is.
Q: How long is the side of 1 decimeter? Then how to calculate its area?
Aren't two answers just a piece of paper? Discuss it.
Q: Did you find anything from the research just now?
Teacher's blackboard writing 1 square decimeter = 100 square centimeter.
2. Exploration 1 m2 = 100 cm2.
Q: Can you guess how many square decimeters 1 square meter equals?
According to the students' speeches, the teacher wrote on the blackboard that 1 square meter equals 100 square centimeter.
3. Give it a try.
Third, consolidate practice and deepen improvement.
1, think about doing 1 and question 2.
Discussion: What are the connections and differences between the two questions in thinking methods?
Step 2 Complete the third question
Fourth, the whole class summarizes.
Q: What did you learn today? How many square decimeters is 1 square meter? How many square centimeters is 1 square decimeter? Do you know how many square centimeters 1 square meter equals?
Task:
1, I want to do the fourth question and add some.
2. Finish thinking.
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