1T |
Good afternoon, everyone |
2Ss |
Good afternoon |
3T |
Look, today we are going to work with a new task. From the curriculum content: shape, space and measurement, under the topic geometric shapes and under the sub-topic (emphasis) Similarity |
4T |
We will work normally, as always, as we have been doing |
5T |
Professor Martín Eduardo Martínez Morales is here and will take evidence of the classes, of what we do and how we do it. You all have to work in a normal way, as usual. |
6T |
We hope all of you solve this task |
DISTRIBUTION OF TASKS [minute 00:52] |
7T |
Now, you all can turn over the tasks sheet and start reading |
READING INSTRUCTIONS [01:07] |
8T |
Attention boys and girls. Have you all read the problem? |
9T |
Who can tell me, what does the task ask? |
10T |
Mr. Legarre |
11S |
Based on the drawing that is there, calculate the height |
12T |
Good. What do the others say? Do you agree? |
13Ss |
Yes!!! |
VERBALIZATION [01:49] |
14T |
You have to calculate the height of the tree that appears in a drawing. |
15T |
Okay? |
16Ss |
Yes!!! |
17T |
Go ahead. Calculate the height of the tree according to the information. |
18T |
Now. Now. Look here |
USE OF ICT [02:18] |
19T |
There on the blackboard, we can see the projected problem that we are solving |
20T |
Use the knowledge acquired in the previous problems, because there, you have calculated the value of the measurements of some triangles with their homologous sides |
21T |
You have also previously calculated the value of proportionality |
DIDACTIC SITUATIONS [02:52] STUDENTS SPEAKING SPANISH [03:18] |
22T |
Understood? |
STUDENTS SPEAKING NAHUATL DIALECT [03:40] |
23T |
Here you have two possibilities. To solve the problem, you can use one of the two methods, ok, but also you can verify the solution using the other method. |
24T |
The most correct thing is to be “like that” (the teacher points out the student's sheet). |
SHARING [03:44] |
25S |
The answer to the problem is 5.23 (She explains the procedure used and writes it on the board) |
26S |
Then we apply a rule of three, and X is 5.23 |
27T |
You got the same results by both methods. Good |
28T |
So, the height of the tree is 5.23 |
29 |
The students go to study outside, into the schoolyard |
30T |
‘This’ times ‘this’ divided ‘this other’ is equal to the height of the post |
31S |
Ah! |
32T |
Now you have to do the same procedure. You are going to choose a small tree and measure its shadow with the measuring tape. |
ADDITIONAL ACTIVITIES [06:41] |
33I |
Teacher, we have to present to the school supervision evidence of the problems that are carried out according to the secondary reform. Could you briefly comment on what are you doing, the students educational level, the kind of instruction, and what mathematical knowledge you are studying in this moment? |
34T |
These students are grade 3 (course A) |
35T |
We are studying the similar triangles. So, the reform involves exercises applying similarity. So we are solving some problems about that. |
36T |
We are working now in the schoolyard; in this way, the students have practical experience to calculate the height of some trees/poles, which are difficult to measure. |
37T |
This problem is solved using similarity of triangles |
38T |
They measure the shadow of some objects, and based on that data, they calculate their heights |
39I |
Okay teacher. Thank you so much. These are the problems currently proposed by the reform. In this moment, are you developing any particular task? |
39T |
Of course, Similarity triangles |