First, learn the subtraction of "5" by number decomposition. Look at the picture and you can say the subtraction formula of 5 separately, and calculate the number quickly and accurately.

Second, through the form of games, feel the fun of mathematics activities and improve the agility and accuracy of children's thinking.

Third, cultivate children's thinking and oral expression skills.

Fourth, stimulate children's interest in learning subtraction.

Teaching preparation:

First, multimedia courseware:

Courseware 1, a basket of apples and pears in the picture, click to show the numbers one by one.

Courseware 2. There are two red and green rice plates on the grass, and five chickens can run and eat rice.

Courseware three, the picture of "little angel delivering letters", four rooms (with house numbers on the door), the owner can open the door by ringing the doorbell.

Courseware 4, 5 animal athletes and 5 sailboats. If you find the right connection, the animal will make a sound. )

Courseware 5. The little monkey was carrying a peach bag. The bag broke a hole and a peach fell out of the bag.

Second, children's learning tools:

1. The child has two rice plates, one broken picture and five chicken plates.

2. Children have a picture of "helping animal athletes find sailboats".

Teaching process:

First, stimulate children's interest in learning by visiting the "animal kingdom".

Teacher: "Just now, the elves in the animal kingdom called the teacher and said that there would be an intelligence game in the animal kingdom today, and they wanted to invite our children to participate. Are the children happy? "

1, play "fruit guessing" game. (Review the decomposition of "5")

"wow! It turns out that there are many' intelligence games' held in the animal kingdom. Let's take a look and guess. "

Play the courseware ①. The teacher introduced and demonstrated the gameplay: "Here are two baskets of fruits, one basket of apples and one basket of pears. The total number of these two baskets of fruit is 5. Click below the apple basket to display the number 1. There are 1 apples in the apple basket. Please guess how many pears should be in this pear basket? " (Example: a basket of apples, a basket of pears, 1 pear How many apples are there? ) after the child answers. Click to display the number 4. The teacher shows the courseware in turn, 2 apples, 3 apples and 4 apples; The children answer one by one and show the numbers one by one.

2. Summary: The elf praised our children for being really smart, and they answered quickly and accurately when playing games!

Second, children explore and communicate their findings. (Learn the subtraction of "5")

1, asking questions makes children think.

Next, let's look at the second intelligence game: play courseware ②.

"There are two rice plates on the grass, one is red and the other is green. How many chickens come to eat rice? Please think about it. What might happen if these five chickens come to eat rice? The elf has prepared dinner plates for the children, and recorded the decomposed pictures and the operating tools of the chicken. Please put a picture of the chicken, record your findings and communicate with the children next to you. "

2. decomposition method of children's exploration 5.

Children operate pictures by hand, and put five chickens in two rice plates to eat rice. There are several ways to divide them. And record it. Teachers' tour guidance.

3. Let children communicate the process and results of their own operations.

Encourage children to boldly communicate their own operation process and results with everyone.

Play courseware ② to show that the chickens eat rice one by one. For example, "There are five chickens on the grass. If there are 4 chickens eating rice in the red plate, how many chickens are eating rice in the green plate? " (1 only) "Yes, because 5 can be divided into 4 and a few" (4 and 1) How to do the subtraction formula? (5-4), list the formulas, what is the number? (The number is 1). The teacher demonstrates the decomposition, calculation and number of other groups one by one in the courseware.

4. Summary: "The elf just saw that children can operate several divisions of five chickens eating rice in two plates according to the contents in the picture, and will also list the subtraction formula to calculate the numbers. Are you happy? Next, I want to invite the children to play a game, "Help the little angel deliver the letter. "

Extended activities:

1, games-find friends (review the addition and subtraction of "5"), music tapes, digital cards.

2. Math corner: Put in homework materials: snowflakes, playing cards, pictures of magnetic animals, pictures of fruits, homemade sandbags, and homemade shake beads boxes (two large jelly boxes are stuck together mouth to mouth, with a cardboard in the middle, and there is a hole and five glass beads on the cardboard. )……

Teaching reflection:

According to the spirit of the syllabus, teachers can create mathematical situations, provide intuitive and operable materials, adopt various teaching methods, arouse children's observation, thinking, exploration and operation, effectively train children's multi-directional thinking, and mobilize their enthusiasm and initiative in learning.