Lesson objective: Understand that when we count to 120, we use number patterns in the same way as when we count to 20.

Students bring prior knowledge of the counting sequence from K.CC.A1 and K.CC.A2. This prior knowledge is extended to larger numbers as students use number patterns to count to 120. A conceptual challenge students may encounter is the continuation of number patterns beyond 100.

The concept is developed through work with a hundred chart, which shows the continuation of number patterns throughout the counting sequence.

This work helps students deepen their understanding of numbers because number patterns continue throughout the counting sequence.

Students engage in Mathematical Practice 7: Students continue to explore the structure of place value as they notice the patterns in the ones place and the tens place throughout the counting sequence.

**Key vocabulary:**

- digit
- ones place
- patterns
- tens place

**Special materials needed:**

- hundred chart
- 120 chart