Teaching material analysis:

In life, group counting is widely used. Through activities, let children know the methods of counting in groups and experience the fun of counting in different ways in operation. And migrate to daily life as much as possible. Counting by group means counting by group (a group of objects) instead of individual objects. Children's ability to count in groups is not sudden, but developed on the basis of children's mastery of the concept of 10. If the method is proper, children's ability to count in groups can reach a skilled level, and the range can reach "100" or even more. It's faster to press a few numbers. Why? Help children understand the functional relationship that the larger the array, the less the count, the smaller the array and the more the count.

Teaching emphases and difficulties:

Learn to count in various ways and estimate a set of quantities according to a reference.

Activity objectives:

1. Learn to estimate the number of objects within 10-30.

2. Try and learn to use various counting methods (such as two numbers and five numbers) to correctly count the number of objects within 30 and determine the total number.

3. Carefully observe and judge the number of peers, and pay attention to and learn from various methods of peers.

Activity reflection:

1. 9 plates of physical candy with different quantities and colors were prepared for children in advance, which brought them a strong interest in hands-on operation and a faster counting speed.

2. It is easier for children to master the digits of "two-two-two" when counting objects in groups; It is difficult for children to master the number of "five-five" figures. But as long as you master the rules and practice more, it is relatively easy to count them, such as: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20; Or 5 10,15,20,25,30. ...

3. The next homework needs to be improved: let the children learn "according to the number of laps" on the operation card to make the numbers clearer.