Shark Learning
Third/Skip Counting

Skip Counting by 9s ()

Practice counting by 9s with number charts
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Teacher Resources
Teaching Notes

Emphasize the unique patterns of counting by 9s, such as the sum of digits always equaling 9 (e.g., 18, 1+8=9; 27, 2+7=9) and the tens digit increasing while the ones digit decreases. Connect this skill to building a strong foundation for multiplication facts of 9.

Vocabulary
Skip counting: Counting numbers by skipping others.
Pattern: A predictable rule or sequence.
Common Mistakes
  • Miscalculating the sum when adding 9 repeatedly.
  • Losing track of the pattern, especially when numbers get larger.
  • Confusing the 'sum of digits is 9' rule with the numbers themselves.
  • Losing track of the count in longer sequences.
  • Confusing with other skip counting patterns (e.g., 8s or 10s).
  • Not recognizing the connection between skip counting and multiplication.
Differentiation
SupportUse a 100-chart to visually track the pattern. Encourage finger-counting up 10 and back 1 for each jump of 9. Highlight the decreasing ones digit and increasing tens digit.
ChallengeChallenge students to find numbers beyond 100 that follow the pattern. Ask them to explain *why* the digit sum pattern works, or to use the pattern to quickly predict missing numbers without calculation.
Discussion Questions
  • What patterns do you notice when you count by 9s?
  • How can skip counting by 9s help you with multiplication?
  • Can you use a number chart to find the next number quickly? How?
  • What patterns do you notice in the numbers when you skip count by 9s?
  • How can skip counting by 9s help you learn your multiplication facts?
  • Can you predict the next number in the sequence without counting each time?
Extension Activities
  • Count by 9s to 90.
  • Make groups of 9.
  • Use fingers to count 9s.
Parent Tip

Count objects in groups of 9 together.

Learning Path
Skill Cluster

Number Sense & Operations

Estimated Time

15 minutes

Skills Practiced
skip counting by 9number patterns
Prerequisites
  • Counting by 1s to 100
  • Basic addition and subtraction within 20
  • Skip counting by 2s, 5s, and 10s
  • Counting by 1s
  • Number recognition
  • Skip counting by 2s, 5s, 10s
Next Steps
  • Mastering multiplication facts for 9s
  • Solving multi-step word problems involving multiplication
  • Understanding place value with larger numbers
  • Multiplication facts for 9s
  • Identifying complex number patterns
  • Mental math strategies for multiplication