Objectives (5 - 7 minutes)

1. Introduce students to the concept of natural numbers, explaining that they are positive integers we use to count objects, people, animals, etc. (Approximately 1 - 2 minutes)
2. Teach students how to write natural numbers from 1 to 100 correctly, with emphasis on the numerical sequence from 1 to 10, from 10 to 20, and from 20 to 100. Students should be able to write the numbers in an aligned manner and understand the difference between units, tens, and hundreds. (Approximately 2 - 3 minutes)
3. Provide students with the opportunity to practice writing natural numbers through practical and interactive activities. (Approximately 2 minutes)

Secondary Objectives:

• Develop students' fine motor skills as they practice writing numbers;
• Stimulate students' logical reasoning and counting ability as they work with the numerical sequence.

Introduction (8 - 10 minutes)

1. Review of Previous Content: The teacher should start the lesson by reminding students of the concepts of numbers and counting they have learned previously. He can ask simple questions to the students, such as "Who can give me an example of a number?" and "How many fingers do we have on one hand?". This helps bring the students back to the topic and prepare them for the new content that will be presented. (Approximately 3 - 4 minutes)

2. Problem Situations: The teacher can propose two problem situations to the students:

   • First situation: "Imagine we have a box with 5 apples and another box with 3 oranges. How can we write the total number of fruits we have?"
   • Second situation: "Now, imagine we have 10 boxes. Each box has 10 candies. How can we write the total number of candies we have?"

   The teacher can encourage students to think about the solutions and discuss the answers out loud. These problem situations help contextualize the new content and engage students in the learning process. (Approximately 3 - 4 minutes)

3. Contextualization of the Subject's Importance: The teacher can explain to the students that knowing how to write numbers is very important in everyday life, as we use numbers to count, measure, organize, and many other things. He can give simple examples, such as counting the students in the classroom, marking the days on the calendar, or measuring the height of a plant. Additionally, the teacher can mention that learning to write numbers correctly is a skill that will be useful in many other areas of study, such as science, geography, and even in leisure activities like games and puzzles. (Approximately 2 minutes)

Development (20 - 25 minutes)

1. Activity "Come Along with the Number" (10 - 12 minutes)

• The teacher should prepare a sequence of numbers from 1 to 100 in advance, written on separate pieces of paper. The numbers should be large and clear so that students can easily see them.
• Next, the teacher should spread the numbers on the classroom floor, making sure they are well spaced out.
• The students will be divided into small groups to carry out the activity.
  • Each group, one at a time, will be called to pick up a number from the floor and with the help of one of the students, place it in the numerical sequence on the board.
  • The teacher should assist the students in identifying and writing the number correctly, reminding them of the difference between units, tens, and hundreds.
  • The process continues until all numbers have been placed in the correct sequence on the board.
  • During the activity, the teacher should ask questions to the students to stimulate discussion and understanding of the topic, such as "What is the next number in the sequence?" or "How many numbers do we have so far?".

2. Activity "Writing Numbers in the Sand" (10 - 12 minutes)

• The teacher should have prepared a quantity of sand in a large and shallow tray.
• The students, again in small groups, will be called, one at a time, to write a natural number in the sand using their finger.
• The teacher should say the number that the students should write, and the students should try to write it as correctly as possible, remembering to align the number and distinguish between units, tens, and hundreds.
• The teacher should take the opportunity to correct any errors and reinforce important concepts, asking questions like "How many tens do we have here?" or "Which number comes after this one?".
• This activity not only reinforces the concept of writing numbers but also provides an opportunity for students to practice their fine motor skills.

Both activities are highly interactive and practical, allowing students to learn in a fun and engaging way. The teacher should pay attention to each student, offering guidance and correcting errors when necessary. At the end of the activities, the teacher should recap the main concepts, reinforcing the correct writing of natural numbers and the numerical sequence. (5 - 6 minutes)

Feedback (10 - 12 minutes)

1. Group Discussion (4 - 5 minutes)

   The teacher should gather all students in a large group discussion to talk about the solutions to the activities. Each group will have the opportunity to share how they solved the problems and what their discoveries were. The teacher should encourage students to explain their reasoning and listen to their peers. During the discussion, the teacher can ask questions to check students' understanding, such as "How do you know that this number is a ten and this one is a unit?" or "How do you know that this number is greater than that one?". The teacher should reinforce the main concepts, correct any misunderstandings, and praise the good strategies used by the students.

2. Connection to Theory (2 - 3 minutes)

   After the discussion, the teacher should make the connection between the practical activities and the theory presented at the beginning of the lesson. The teacher can ask: "How do the activities we did today help us better understand how to write natural numbers?". Students should be able to recognize that the activities helped them practice writing numbers and better understand the structure of the numerical sequence.

3. Final Reflection (4 - 5 minutes)

   To conclude the lesson, the teacher should propose two moments of reflection for the students. The first question is: "What was the most challenging part for you in today's activity?". Students should be encouraged to share their difficulties, allowing the teacher to identify areas that need more attention and plan future lessons accordingly. The second question is: "What did you learn today that you think can be useful in the future?". This question encourages students to reflect on the value of what they learned and the practical application of the concepts learned. The teacher should listen carefully to the students' answers, praising the positive points and offering support where needed.

This feedback is an essential part of the learning process, as it allows the teacher to assess students' progress, correct any misunderstandings, and encourage reflection and self-assessment. Additionally, group discussion and connection to theory help consolidate learning and make the lesson more meaningful for students.

Conclusion (5 - 7 minutes)

1. Summary of Contents (2 - 3 minutes)

   The teacher should start the conclusion by summarizing the main points of the lesson. He can remind students about what natural numbers are, how to write them correctly, and the importance of aligning numbers and distinguishing between units, tens, and hundreds. The teacher can use the board or posters with numbers to reinforce the visualization of the concepts. He can also ask quick questions to check students' understanding, such as "Who can tell me what a natural number is?" or "How can we write the number 25?".

2. Connection between Theory and Practice (1 - 2 minutes)

   Next, the teacher should explain how the lesson connected theory and practice. He can mention that through the playful activities, students were able to apply theoretical concepts in a concrete way. For example, the teacher can say: "In the 'Come Along with the Number' activity, you could see and touch the numbers, which helped you better understand the numerical sequence. And in the 'Writing Numbers in the Sand' activity, you could practice writing in a fun and interactive way".

3. Extra Materials (1 minute)

   The teacher can suggest some extra materials for students who want to deepen their knowledge on the subject. This may include online games for writing numbers, textbooks with math activities, or educational websites with printable exercise sheets. The teacher can say: "If you want to practice writing numbers more, I recommend the XYZ website, where you can find many fun games and activities. And if you enjoy reading, the school library has several interesting math books for you to explore".

4. Importance of the Subject (1 - 2 minutes)

   Finally, the teacher should reinforce the importance of what was learned. He can say: "The ability to write numbers correctly is very important in our daily lives. We use numbers to count, measure, organize, and do many other things. Additionally, knowing how to write numbers correctly is a skill that will help you in many other subjects, such as science and geography. It is also a skill that you will use in games and leisure activities, like puzzles and board games".

   This conclusion helps consolidate learning, emphasize the relevance of the content, and encourage continuous study. By the end of the lesson, students should feel confident in their ability to write and understand natural numbers.