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Count by 10s

Counting by 10s means organizing quantities into equal groups of ten and producing the sequence 10, 20, 30, …, 100, including recognizing that each successive number is 10 greater than the previous one. This understanding connects skip-counting to the tens place, representations such as ten frames and number lines, and the foundation for adding and subtracting tens; it does not include extending the pattern to larger numbers or formal multiplication generalizations.

Detailed Explanation: Count by 10s

To count by 10s, say numbers that are 10 more each time:

10, 20, 30, 40, 50, 60, 70, 80, 90, 10010,\ 20,\ 30,\ 40,\ 50,\ 60,\ 70,\ 80,\ 90,\ 100

Each number represents another group of ten. For example, (30)(30) means 3 groups of 10.

Example: Count by 10s from (30)(30) to (70)(70).

  1. Start at (30)(30).
  2. Add one more group of ten: (30+10=40)(30+10=40).
  3. Add 10 again: (40+10=50)(40+10=50).
  4. Add 10 again: (50+10=60)(50+10=60).
  5. Add 10 again: (60+10=70)(60+10=70).

So, the sequence is:

30, 40, 50, 60, 7030,\ 40,\ 50,\ 60,\ 70

Each step moves forward by (10)(10), and the tens digit increases by 11.

Learn by doing: Count by 10s

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    Skip Counting Upward by 10 - Next 3 in Pattern

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