Skip Counting by 20s (185)

Teaching Notes

Introduce skip counting by 20s by relating it to counting by 2s and adding a zero, or by thinking of two groups of 10. Use a number line or 100-chart (extended to 200/300) to highlight the patterns. Emphasize that numbers end in 0, and the tens digit increases by 2 each time.

Vocabulary

Skip counting: Counting by a given number.

Sequence: Numbers in a specific order.

Common Mistakes

• Forgetting to add the zero (e.g., 2, 4, 6 instead of 20, 40, 60)
• Confusing with skip counting by 10s or 5s
• Losing track of the pattern, especially when numbers exceed 100

Differentiation

Discussion Questions

• What pattern do you see when you skip count by 20s?
• How is skip counting by 20s similar to skip counting by 2s or 10s?
• When might you use skip counting by 20s in real life?

Extension Activities

• Count by 20s using a number line.
• Draw groups of 20.
• Sing skip counting songs.

Parent Tip

Have your child count groups of 20 small objects, like blocks.

Skill Cluster

Number Sense and Operations

Estimated Time

15 minutes

Skills Practiced

Prerequisites

• Skip Counting by 2s
• Skip Counting by 10s
• Understanding Place Value to 100

Next Steps

• Skip Counting by 25s
• Skip Counting by 50s
• Introduction to Multiplication (Multiples of 20)