moving target
1. Learn the addition and subtraction of 8 by looking at the picture.
2. The whole removed part should be calculated by subtraction.
3. Learn the subtraction math problem of oral test series 8 to develop children's imagination and thinking ability.
4. Be able to think positively and improve understanding and calculation ability.
5. Let children realize that there is mathematics everywhere in life.
Teaching emphases and difficulties
Let the child know that the whole removed part should be calculated by subtraction.
Activities to be prepared
multimedia courseware
Activity process
1. Review the composition of 8
Eight birds fly, 1 A bird flies in front, followed by several birds? (7) How do you know? (8 can be divided into 1 and 7)8 can also be divided into several and several, and so on.
2. Organize children to learn the subtraction of 8
Show courseware:
(1) There are 8 birds in the tree, 1 flew away. How many birds are left in the tree?
The children spoke the questions raised by the teacher:
The teacher asked, "How do you know?" Guide children to say that 8 is removed 1, leaving 7, that is, the whole removed part should be calculated by subtraction formula, and guide children to list 8- 1=7 to know what 8, 1, 7 stands for. (2) There are 8 butterflies on the grass, and 2 butterflies fly away. How many butterflies are left on the grass?
Teachers organize children to calculate formula 8-2=6 as required, and teachers write on the blackboard.
There are eight planes in the sky, and three have flown away. How many planes are left?
Teachers organize children to calculate formula 8-3=5 as required, and teachers write on the blackboard.
Xiaohong has eight balloons and gave Xiaohua four. How many balloons are left?
Teachers organize children to calculate formula 8-4=4 as required, and teachers write on the blackboard.
3. Let children freely create 8 subtraction math problems.
Guide children to dictate about 8 math problems. Subtraction, such as: Sister has 8 sweets, ate 5, how many are left? There are 8 fish by the river, 6 have already swam away, how many are left? Wait a minute.
Summary: The teacher said that the subtraction formula of 8 is reduced from 1 to 7 according to the law, according to the child's experience.
8- 1=7,8-2=6,8-3=5,8-4=4,8-5=3,8-6=2,8-7= 1。
Teaching reflection
Using multimedia courseware to show vivid life scenes is helpful for students to understand mathematics in real life, feel the close relationship between mathematics and daily life, increase their closeness to mathematics and experience the fun of using mathematics.