Lesson Plan: Using 10 as a Benchmark in the Formation of Numbers (11-13)

Objective: - Students will understand the concept of using 10 as a benchmark in the formation of numbers from 11 to 13. - Students will be able to represent numbers using place value and understand the relationship between tens and ones.

Materials: - Whiteboard or chart paper - Markers - Number cards (1-9) - Math Journals - Pencils - Crayons or colored pencils

Warm-up (5 minutes): 1. Begin the lesson by reviewing the concept of place value and the value of each digit in a number. 2. Ask students to count from 1 to 10 together as a class.

Introduction (10 minutes): 1. Write the numbers 11, 12, and 13 on the whiteboard or chart paper. 2. Ask students if they notice anything special about these numbers. 3. Guide the discussion towards the fact that these numbers have a 1 in the tens place and a number from 1 to 3 in the ones place. 4. Explain that when we have a 1 in the tens place, we can use 10 as a benchmark to help us understand these numbers better.

Instruction (15 minutes): 1. Show the number cards from 1 to 9 to the class. 2. Ask students to choose a number card and hold it up. 3. Write the number chosen by the student on the whiteboard or chart paper. 4. Ask the class to identify the number that comes after the chosen number. 5. Write the number that comes after on the whiteboard or chart paper. 6. Repeat this process a few times, emphasizing that when we add 1 to a number, the number in the ones place changes, but the number in the tens place remains the same. 7. Explain that when we reach 10, we can use it as a benchmark to help us form numbers from 11 to 13. 8. Write the number 10 on the whiteboard or chart paper. 9. Ask students to identify the number that comes after 10. 10. Write the number 11 on the whiteboard or chart paper. 11. Repeat this process for numbers 12 and 13.

Guided Practice (10 minutes): 1. Distribute Math Journals and pencils to each student. 2. Instruct students to draw a line down the middle of a page in their Math Journals. 3. On one side, ask students to write the numbers 11, 12, and 13. 4. On the other side, ask students to write the numbers 1 to 10. 5. Instruct students to use the numbers 1 to 10 as a benchmark to help them complete the numbers 11 to 13. 6. Circulate around the classroom to provide assistance and guidance as needed.

Independent Practice (10 minutes): 1. Distribute crayons or colored pencils to each student. 2. Instruct students to choose a number from 11 to 13 and draw a representation of that number using place value blocks in their Math Journals. 3. Encourage students to label the tens and ones place in their drawings. 4. Allow students to share their drawings with a partner or the whole class.

Conclusion (5 minutes): 1. Review the concept of using 10 as a benchmark in the formation of numbers from 11 to 13. 2. Ask students to share one thing they learned from the lesson. 3. Summarize the lesson by emphasizing the importance of understanding place value and the relationship between tens and ones.

Note: Adjust the timing of each activity based on the needs and pace of your students.