Lesson objective: Connect different representations of a teen number.

This lesson provides an opportunity for students to apply their knowledge and understanding of place value with teen numbers to both real-life and mathematical situations. Students are asked to match cards representing teen numbers in six different ways.

Key Concept students will use:

- The numbers 11-19 are made of a ten and 1, 2, 3, 4, 5, 6, 7, 8, or 9.

Skills students will use:

- Recognizing the value of the ten in a teen number.
- Recogizing how many more ones than ten make a specific teen number.
- Recognizing pictorial and numeric representations of teen numbers.

Students engage in Mathematical Practice 2 (Reason abstractly and quantitativley) as they make connections between numeric, pictorial, and real-life representations of teen numbers.

**Key vocabulary: **

- digit
- ones
- teen number
- tens frames

**Special materials needed:**

- one copy of teen number matching cards for every two students (can be done in groups of 3 or 4)