Beijing normal university printing plate primary school grade two mathematics volume one
How long is the instructional design of 1 meter?
Teaching objectives:
1. Understand the meter and its practical significance in observation and measurement activities, initially establish the concept of the length of 1 meter, master 1 meter = 100 cm, and carry out simple unit conversion.
2. Initially learn to measure the length of an object in meters (limited to whole centimeters), estimate the length of the object, and choose a suitable unit to represent the length of the object.
3. Experience the significance of measuring length in daily life in measuring activities.
Key points: the practical significance of rice and the relationship between rice and centimeter.
Difficulty: Choose a suitable unit to represent the length of an object.
Teaching preparation: PPT courseware and three-meter ruler.
First, the scene introduction:
1. Last class, we learned the unit of length-centimeter. How long is 1 cm? Can you tell your deskmate with your finger?
2. Summary: Everyone spoke very well. The amusement park is really interesting. Brother Giraffe and his little turtle are also going to the amusement park. Let's see what happens to them (PPT shows the picture) The small animals rushed to run inside, but the giraffe was stopped by the security guard at the door. Do you know what is going on? (Because amusement parks require "tickets for people over height 1 meter") How long is 1 meter? Write on the blackboard.
Second, the new interactive award.
1, understand rice.
Show me the meter ruler: Students, this is a meter ruler, and its length is 1 meter. How long is 1 meter? Open your arms and I'll measure you.
2 guess: classmate, where did you guess one meter went to your body? Ask the students to estimate and guide them to know the length of 1 meter.
③ Comparison: Compare with the meter ruler again, verify your guess, and see which part of your body 1 meter actually reaches.
④ Find out: Which objects in the classroom are about 1 m in length?
2. Understand the relationship between meters and centimeters.
① Understanding 1 m = 100 cm
Please observe the meter ruler carefully and think about it: What is the relationship between meter and centimeter? How many centimeters is 1 meter? Health: 1 m is 100 cm, and 1 m is equal to 100 cm. Teacher: How do you know? (blackboard writing) ② Give the students a ruler and let them measure the length of 1 meter with a short ruler.
(3) Report the results of the quantity.
Step 3 measure it.
Measure the length of our classroom? Measure the length of the blackboard? How long is the door?
Teacher B leads the students to carry out field measurement, and the students are divided into three groups in groups of three.
Teacher's Tip: First aim the "0" scale line of the wooden ruler at one end of the classroom, then measure one meter and make a mark. After measuring the classroom, it is several meters or centimeters, if not the whole meter. After testing a group, you can ask your classmates to form a group to continue the test.
C. report the results of quantity.
D, understand the role of rice:
(1) Today, the teacher brought some sticks, which are 1 cm long. We will use these sticks to measure the length of the classroom. Do you have any ideas? Health: The stick is too short and it is too troublesome to measure.
(2) Summary: Centimeter is used to measure the length of relatively short objects, while measuring the length of classroom floor, or a relatively long distance, requires a relatively large unit of length, that is, meters. Rice is widely used in life, and we often meet it. (blackboard writing)
Third, consolidate the practice.
1, select the appropriate unit.
The pencil is about 17 () the eraser is about 3 () the towel is about 60 () the flagpole is about 8 () the loofah is about 35 () the house is about 3 () the length of a bus is about 1 () the desk is about 70 () Miss Li's height is 65438+.
2. Calculation:15cm+8cm = () cm16cm-9cm = () cm 6m-5m = () m1M5 cm+1M3cm = () m () cm.
Fourth, the whole class summarizes. What did everyone learn in this class? What did you get?
Blackboard design:
How long is 1 meter?
1 m = 100 cm
We usually use centimeters to represent shorter objects.
We usually use rice to make longer objects.