1. Teaching objectives

1. 1 knowledge and skills:

(1) Let students know the unit of length, establish the representation of 1 meter, and identify the length of some common objects in life. (2) enable students to find the law in practice and learn how to measure the length of an object with a ruler. 1.2 process and method:

In the process of computer exploring length measurement, students' preliminary application ability and mathematical ability of observation, induction and generalization are cultivated.

1.3 Emotional attitudes and values:

Let students feel the charm of mathematics in their daily life and realize that some measuring tools are powerful tools to explore mathematical knowledge and gain successful experience.

2. Teaching emphases/difficulties

2. 1 teaching focus:

Learn to measure the length of an object with a meter ruler. 2.2 Teaching difficulties:

Experience the actual length of 1 meter, understand the diversity of measurement methods, and cultivate students' estimation consciousness.

3. Teaching tools

Courseware, multimedia equipment, meter ruler, etc.

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teaching process

First, situational introduction

Teacher: Students, we learned the unit of length measurement: centimeter. So who can go to the blackboard and measure its length?

Student: Students go to the blackboard and measure with a scale.

Teacher: Do students find it inconvenient to measure with scales? Do you feel that the scale is too short and the blackboard is too long?

Student: The ruler is too short. You can't move the ruler many times to measure the length of the blackboard. Teacher: Today, I provided my classmates with a new measuring tool-the meter ruler. Health: It is easier to measure the length of the blackboard with a meter ruler. Teacher: Show me a picture of the situation.

Teacher: The measuring tool in the picture is called the meter ruler. (Multimedia display picture)

Second, explore new knowledge (1), understanding of rice

Teacher: We have learned the length unit of centimeters before. Now let's look at another unit of length. Length unit: centimeter symbol: centimeter length unit: meter symbol: meter decimal conversion: 1 meter = 100 centimeter

Health: Know the symbol of meters and make clear the conversion relationship between meters and centimeters.

Teacher: Now let's look at a topic. (Multimedia presentation of the theme)

A square table is 80 cm long and 60 cm wide. How long and wide is it? . Teacher: Now let's do the conversion. 100 m =0.8 m long =80 cm =80 degrees.

100 m =0.6 m wide =60 cm =60

Teacher: Now let's look at a topic in groups and see which group calculates quickly and well. (Multimedia presentation of the theme)

The double bed is 200 cm long and 180 cm wide. How long and wide is it? . Student: Group calculation.

Teacher: Now let's look at the correct answer and see which group did the best! (Multimedia display answer)100m = 2m long =200 cm =200

100 m = 1.8 m wide = 180 cm = 180÷2, the perception of meters.

Teacher: Now let's look at the following topic? (Multimedia presentation question) Can you find the correct answers to the following objects? Xiaoming's father is 500cm tall, the length of an egg is 0. 12 m, the length of a pencil is 0.06m, and the length of a flagpole is1.75 m.

Health: This widget discusses how to find the answer to the length of the object on the left. Teacher: Students should carefully perceive how long the rice is. Student: Students connect the questions.

Teacher: Multimedia presentation of answers

Teacher: Now let's look at the next question? Can you fill in the correct units in the brackets below? . 1, the length of a finger is about 7() 2, and the height of a teacher is about 3 ().

3. The height of a second-grade child is about 1.2 (). 4. Your teacher is probably 176 ().

5. The five-star red flag is about 192 () in length and 1.28(6) in width. The length of the eraser is 5 (). Teacher: Multimedia presentation of answers.

Third, the meter ruler knows

Teacher: Now let's see what parts the meter scale is made of. Student: The rice scale is made up of scales.

Teacher: What are the scales of the meter scale? (Multimedia presentation of answers)

)

Teacher: Do you know what a small square on the meter scale stands for? (Multimedia presentation of answers)

Teacher: Do you know what the five squares on the meter scale stand for? (Multimedia presentation of answers)

Teacher: Do you know what the meter scale of 1 stands for? (Multimedia presentation of answers)

Teacher: Now let's look at the length of the meter scale. (Multimedia presentation of answers)

Four, meter scale measurement

Teacher: Now let's measure the length of the building block below. (Multimedia display measurement step) Step 1: Align the edge of the meter scale with graduation lines with the long side of the wood block.

Teacher: Note: When measuring, you must pay attention to the zero scale line. When reading, you must look straight, not squint.

Third, consolidate and improve.

Teacher: Now let's see which measurement method is correct. Each group answers first (the courseware shows the topic)

Health: This measurement method is wrong. The zero scale line is not aligned.

Health: this method is not right, it is not on the object.

Teacher: Now we can finish the following questions by ourselves. (multimedia presentation topic) 1, the length of the ant is1m. The height of this house is 3.5 cm. The height of the electric wire tower is 25cm 4, and the length of a banana is10cm. The length of a pen is 8m 7, and the height of a big tree is 8cm.

Student: Students can answer questions quickly through the previous exercises. Teacher: Multimedia shows the correct answer.

Teacher: Students fill in the correct units of the following objects in groups. (Multimedia Presentation Topic) 1, the length of a watermelon is 15() 2, the length of a grape is 2() 3, the length of a cucumber is 0. 14() 4, the height of an ostrich is 3() 5, and the height of a giraffe is 350 (). Teacher: Multimedia presentation of answers

1, the length of watermelon is 15( cm) 2, the length of grape is 2( cm) 3, the length of cucumber is 0. 14( m) 4, the height of ostrich is 3( m) 5, the height of giraffe is 350( cm) 6, and that of oriole.

1, which is aligned with the edge of the measured object 2 and the zero scale line.

3. Read the head-up 8 assignment.

1. Fill in the correct units of the following animals: 1, the cock is about 0.25() 2, the puppy is about 45() 3, the pony is about 1.4() 4, the parrot is about 15() 5, and the kitten is about 22 ().

1, the cock is about 0.25( m) 2, the puppy is about 45( cm) 3, the pony is about 1.4( m) 4, the parrot is about 15( cm) 5, the kitten is about 22( cm) 6 and the elephant is about 2.2. 1000cm = m3, 2.5m = 4cm4, 400cm = M5,1.5m = cm.

6.20m= cm Analysis: 1, 25cm=0.25m 2, 1000m3, 2.5m = 250cm 4,400cm = 4m5, 1.5m= 150cm 6.

Course summary

In today's lesson, students will learn another unit length "meter", master the conversion between meter and centimeter, and explore the method and law of measuring the length of an object with a meter ruler. There are many problems in life to be measured. I hope you can solve them with what you have learned today. This lesson is mainly to let students master the meaning of rice and the use of meter ruler. In teaching, it involves students' interaction, group learning and other teaching modes, which truly embodies students' dominant position. Let students do activities in class, find knowledge and experience knowledge. In addition, multimedia teaching methods are adopted in teaching, so that students can master the use process of the meter ruler more clearly.

Write on the blackboard.

Section 2 Understanding the length unit of meters: the use of meters (m) meters;

1, aim at the edge 2 of the measured object, aim at the zero scale line 3, and look up when reading.