Lesson objective: Count a collection by tens to tell how many dots there are.

This lesson helps to build fluency with counting. Ten frames are used here because they support students in grouping ten ones into one bundle of ten. This work develops students' understanding of the counting by tens sequence.

Students engage in Mathematical Practice 8 (look for and express regularity in repeated reasoning) as they count by tens. They will learn that the next number in the sequence is ten more (or one more group of ten).

**Key vocabulary:**

- ten frame
- collection
- group of ten

**Special materials needed:**

- mini ten frames
- counters
- dot cards
- number cubes