Grade 2/Skip Counting
Skip Counting by 9s (182)
Practice counting by 9s with number charts
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⭐ Easy5
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📊 Medium5
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🔥 Hard5
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1 | ID: 162 | 1 Qs | |
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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