1, skilled in oral calculation, integer decimal plus one digit and corresponding subtraction.

2. Enable students to use what they have learned to solve practical problems in life and cultivate the flexibility of thinking.

training/teaching aid

Courseware and game slides of Example 8.

teaching process

First, review.

Answer the following questions orally.

There are () ten and () eleven in 1.36.

2.5 Ten and seven one is ().

3.65 consists of () ten and () eleven.

4.2 Ten and five add up to ().

Second, new funding.

1. Teaching example 8.

(1) Courseware demonstration: Mom bought three rows of Robust drinks, each with 10 bottles, and Xiaoming bought two bottles of Robust drinks. How many bottles of strong drinks did they buy? How to make a formula?

After the students answered, the teacher wrote on the blackboard: 30+2=32.

Question: 30+2 means ten and one. What's the total?

Guide the students to say: three tens and two eleven add up to 32.

(2) Take 2 bottles from 32 bottles (courseware demonstration).

Question: How many bottles are left? How to form?

After the students answered, the teacher wrote on the blackboard: 32-2 = 30.

(3) Question: What is two plus thirty * *?

How to make a formula?

The students answered, and the teacher wrote it on the blackboard according to the students' answers.

2+30=32

2. Exercise: "Do it" on page 48.

Question 1

Let the students put a stick first, and then write the formula on the stick.

After the students finish writing, assign a student to demonstrate the column calculation on the blackboard and modify it collectively.

Question 2

Appear in the form of playing games to see who has the most flexible mind.

Third, consolidate the practice.

1. orally calculate the following questions.

( 1)50+6 30+7 60+9 20+8

6+50 7+30 9+60 8+20

(2)90+8 20+3 50+9 70+6

98-8 23-3 59-9 76-6

Note: Write 50+6 on the front and 6+50 on the back of the card. When doing oral calculation, let one student look at the number of questions in front, and then let another student say the questions behind and do oral calculation. If the students have difficulties, turn to the back and let them have a look at the oral calculation.

2. Do the exercise 1 1 of 1.

Fourth, homework

30+8= 77-7= 70+2=

9+20= 10+5= 28-8=

65-5= 3+20= 90+9=