Propulsion rate per unit area: 1 km2 = 1 hectare; 1 hectare =10000m2; 1 m2 = 100 square decimeter; 1 square decimeter = 100 square centimeter; 1 cm2 = 100 mm2.
Progress between time units: 1 year = 12 months; Average year 1 year =365 days; Leap year 1 year =366 days; 1 month =3 1 day; 1 abortion =30 days; Normal year February =28 days; February of leap year =29 days; 1 day =24 hours; 1 hour =60 minutes; 1 =60 seconds; The ratio between mass units: 1 ton = 1000 kg; 1 kg =1000g.
Analysis of teaching difficulties in primary school mathematics measurement units;
1. The difficulties in the teaching of mathematical measurement units in primary schools mainly stem from the thinking characteristics of primary school students and the abstraction of measurement units. The application fields and coverage of measurement units are wide. At present, the teaching of measurement units lacks fixed teaching mode and successful teaching experience, and the problems in teaching lead to unsatisfactory teaching effect.
2. Students lack the consciousness of active observation and thinking, lack of experience accumulation, lack of cognition in the absence of physical objects, single classroom teaching method, simple practical activities, lack of in-depth excavation, and students lack a correct understanding of the necessity and importance of the existence of measurement units. In classroom teaching, due to the lack of practical operation and intuitive presentation, the classroom teaching atmosphere is dull, and students' thinking perception can not be effectively improved.
3. Students usually memorize the relationship between the enrollment rate of the unit and lack a real understanding, which makes students' interest in learning decline. With the implementation of the new curriculum reform, based on the teaching concept of emphasizing students' subjectivity, the classroom teaching mode will also undergo reasonable and scientific changes. Teachers should start with real life experience, explore the connotation of measurement units, explore effective teaching ideas and strategies, and effectively improve the measurement teaching effect.