1, Simple multiplication table: Encourage students to recite and memorize multiplication tables, so that they can answer basic multiplication questions quickly.
2. Group counting: divide the numbers in the multiplication question into smaller groups for counting. For example, for the problem 4x3, you can divide 4 into 2 and 2, calculate it twice: 2x3=6, and then add the result of another group: 6+6= 12.
3. Change the order: Students can try to exchange the order of the numbers in the multiplication formula to see if they get the same answer. For example, the 3x4 question can be changed to 4x3, and the result is still 12.
4. Use multiples: Students can use known multiples to solve multiplication problems. For example, in the problem of 5x4, students can know that 5 is a multiple of 2, so they can first calculate 2x4=8, plus 5: 8+5 = 13.
5. Graphics and models: Students can use graphics or models to help them understand the concept of multiplication. For example, in multiplication problems, numbers are represented by squares or circles, and then the total number of each figure is calculated.
The purpose of multiplication:
1, solving practical problems: multiplication is widely used in daily life. For example, when shopping, calculating the total price, calculating the daily interest, counting the number of people, etc. all need multiplication. Through multiplication, we can get the desired result quickly and solve the problems in real life.
2. Scientific calculation: In the fields of scientific research and engineering, multiplication also plays an important role. For example, in physics, speed is obtained by dividing distance by time, and the distance traveled can be obtained by multiplying speed by time. It is often necessary to calculate the area and volume in engineering, which also requires multiplication.
3. Data analysis: Multiplication also plays an important role in statistics and big data analysis. For example, sample variance and covariance are indicators to measure the degree of data variation, and their calculation needs multiplication. In addition, multiplication is often used for data preprocessing and feature engineering in data mining and machine learning.