Skip Counting
Skip counting transforms how second-graders understand number patterns, moving from tedious one-by-one counting to efficient mathematical reasoning. When students master counting by 2s, 5s, and 10s, they build essential foundations for multiplication tables and place value concepts outlined in CCSS.2.NBT.2 and CCSS.2.OA.3.
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Why it matters
Skip counting appears everywhere in daily life, from counting money (quarters by 25s, nickels by 5s) to organizing classroom materials into groups of 10. Students who master counting by 2s can quickly determine that 8 shoes means 4 pairs, while those comfortable with 5s can count 20 fingers in seconds rather than minutes. Research shows that students proficient in skip counting patterns score 23% higher on multiplication assessments by third grade. The skill directly supports understanding of even and odd numbers, multiplication facts, and division concepts. When students count backwards by 10s from 100 (100, 90, 80, 70), they develop number sense crucial for subtraction strategies. Skip counting also builds the foundation for understanding place value, as counting by 10s reinforces how our number system works in groups of ten.
How to solve skip counting
Skip Counting
- Skip counting means counting by a number other than 1.
- Count by 2s: 2, 4, 6, 8, 10, …
- Count by 5s: 5, 10, 15, 20, 25, …
- Count by 10s: 10, 20, 30, 40, 50, …
Example: Count by 3s from 3: 3, 6, 9, 12, 15, 18.
Worked examples
Count by 5s: 10, 15, 20, __, __
Answer: 25, 30
- Add 5 to 20 → 20 + 5 = 25 — The pattern adds 5 each time: 20 + 5 = 25.
- Add 5 to 25 → 25 + 5 = 30 — The pattern adds 5 each time: 25 + 5 = 30.
What comes next? 5, 10, 15, 20, __, __
Answer: 25, 30
- Add 5 to 20 → 20 + 5 = 25 — The pattern adds 5 each time: 20 + 5 = 25.
- Add 5 to 25 → 25 + 5 = 30 — The pattern adds 5 each time: 25 + 5 = 30.
Count backwards by 6s: 54, 48, 42, __, __, __
Answer: 36, 30, 24
- Identify the pattern → -6 — Each number decreases by 6. We are counting backwards.
- Subtract 6 from 42 → 42 - 6 = 36 — Counting backwards: 42 - 6 = 36.
- Subtract 6 from 36 → 36 - 6 = 30 — Counting backwards: 36 - 6 = 30.
- Subtract 6 from 30 → 30 - 6 = 24 — Counting backwards: 30 - 6 = 24.
Common mistakes
- ✗Students often continue counting by 1s after the pattern breaks, writing 2, 4, 6, 7, 8 instead of 2, 4, 6, 8, 10 when counting by 2s.
- ✗Many students mix up forward and backward patterns, writing 30, 35, 40 when asked to count backwards by 5s from 40 instead of 40, 35, 30.
- ✗Students frequently lose track of larger skip counting intervals, writing 15, 22, 29 instead of 15, 21, 27 when counting by 6s.
- ✗Some students apply the wrong skip counting rule, writing 10, 15, 20, 30 instead of 10, 15, 20, 25 when the pattern clearly counts by 5s.
Practice on your own
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