Lesson objective: Compose two-digit numbers using component tens and ones.

This lesson helps to build procedural skill with composing two-digit numbers with component tens and ones. Base-ten blocks are used here because it supports understanding of the composition of two-digit numbers. This work develops students' understanding that two-digit numbers are made of tens and ones.

Students engage in Mathematical Practice 2 (students make sense of the relationship between the numerals and the quantities; students will notice the pattern in the numerals as the quantities those numbers represent change) as they build a series of two-digit numbers on their way to composing 100.

**Key vocabulary:**

- ones place
- tens place

**Special materials needed:**

- linking cubes
- deck of cards