Mathematics can draw interesting pictures to show more or less things than handwritten newspapers, such as drawing two groups of rabbits, one group is more and the other is less, so that students can visually compare.

One, count.

When counting, count in a certain order, from 1 to the number corresponding to the last object, that is, the last count, which is the total number of such objects.

Second, how much?

Same number: when two objects correspond to each other one by one and there is no surplus, the two objects are said to have the same number; Ratio: when two objects are in one-to-one correspondence, one of them has surplus, with more surplus and no surplus; When comparing the number of two objects, we can use the one-to-one correspondence method.

Third, the actual operation

Let students know the meaning of "same quantity" and "small quantity" through practical operation, and compare the number of objects one by one. Through learning, students' observation ability, thinking ability, language expression ability and hands-on operation ability are fully developed.

Skills and classic application problems of winning more with less

First of all, it summarizes the problem that more is better than less.

To sum up, there are three kinds of problems: one is to seek more and less; The second is to find a bigger number; The second is to find a bigger number. There are methods and skills to do this kind of problem. As long as you master the tricks, it is easy to get full marks.

The skills of more than less than the first grade are decisive: less than doing things, skillfully using the size of painting, using addition to find large numbers, and subtraction to calculate small teaching. If you find more or less, use subtraction to calculate.

Second, classical application problems are not used much.

1, Xiaohong made 16 paper flowers, Xiaoqing made 9, how much did Xiaohong do more than Xiaoqing?

There are 50 poor Chinese rose flowers and 56 poor roses in the park. How much worse is the Chinese rose than the rose?

3. Xiaoming has 39 cards, and Xiaohua has more cards than Xiaoming 12. How many cards does Xiaohua have?

4. There are 39 Xiao Ming, and there are fewer small flowers than Xiao Ming 12. How many cards does Xiaohua have?

5. There are 25 grey rabbits and 20 white rabbits. What kind of rabbits are more? How much more?