Read the question and find out what is in it; What is the unit "1"? ; What is the most critical sentence? Draw a line graph according to the key sentences and get the equivalence relation. The unit "1" is known, that is, how much is a fraction of a number, which is calculated by multiplication formula;
The unit "1" is unknown, so you can find the fraction of a number and calculate it by division. Set the unit "1" to x to solve the column equation or division.
Introduction to primary school mathematics:
Through teaching materials, children are taught a series of knowledge about number, four operations, formulas for calculating figures and lengths, unit conversion and so on, laying a good mathematical foundation for junior high school calculation and daily life. Frieden Noel, a Dutch educator, said: "Mathematics comes from reality and must be rooted in reality and applied to reality."
Indeed, modern mathematics requires us to observe the world from a mathematical perspective and explain the world in mathematical language. 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. From our educational goal, while imparting knowledge, we should pay more attention to cultivating students' comprehensive ability of observation, analysis and application.
Quantitative relationship:
1, number of copies × number of copies = total number of copies, total number of copies/number of copies = number of copies, total number of copies/number of copies = number of copies.
2, 1 multiple × multiple = multiple, multiple1multiple = multiple, multiple/multiple = 1 multiple.
3. Speed × time = distance, distance/speed = time, distance/time = speed.
4. Unit price × quantity = total price, total price/unit price = quantity, and total price/quantity = unit price.
5. Work efficiency × working hours = total workload, total workload ÷ work efficiency = working hours, total workload ÷ working hours = work efficiency.