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. As 9 plates of physical candy with different quantities and colors were prepared for children in advance, it brought children a keen 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.

Large class mathematics; Who has more candy?

Activity objectives:

1. Try to count the number of objects correctly within 20 with different counting methods, and judge whether you win or lose by comparing the numbers.

2. Experience the fun of cooperating with peers.

Activity preparation: 5 baskets of candy, 10 plates, etc.

Activity flow:

1. Lead out the game (value analysis: understand the basic method of rock-paper-scissors game)

Question: Have you ever played the game of rock, paper and scissors? How to play?

Summary: fist is stone, forefinger and middle finger are scissors, and five fingers are cloth. Scissors wrap cloth; Stone is better than scissors; Bushengshi

2. Count candy (value analysis: further consolidate the gameplay while playing with peers, and try to correctly count the number of objects within 20 by various counting methods).

Children's first rule of the game:

-A group of 2 people, one basket of candy for each group, and one plate for each person;

-Play with scissors, stones and cloth. Whoever wins will take a candy in the basket.

The teacher shouted stop, and the game was over. Count how many sweets you have and see who has more. Question: Count how many sweets do you have? Who gets more candy?

Summary: It seems that the more times you win in the game of scissors, stone and paper, the more chances you get candy, and the more candy you get.

The rules of children's second game:

-change friends and pair up;

-Play rock, paper, scissors. Whoever wins will grab a handful of candy from the basket;

Count how many sweets do you have? Whoever has more candy will win;

Question: Who won? How many sweets did you buy? How do you calculate it?

Three. Expansion of activities

Today, we got candy with the game of scissors, stone and paper, and found the children who got more candy by counting. Besides winning or losing in the game, when will we also use the game of scissors, stone and paper?