Write down the numbers that are common to the skips in twos and fives.
Step 1: List numbers in skip counting by 2: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20...
Step 2: List numbers in skip counting by 5: 5, 10, 15, 20, 25, 30...
Step 3: Find common numbers: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100
Answer: The numbers common to skip counting in twos and fives are 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
Explanation
Numbers that appear in both skip counting patterns (by 2 and by 5) are multiples of both 2 and 5. Since 2 and 5 are factors of 10, all multiples of 10 will appear in both patterns. Students identify these by finding numbers that have both the circle and triangle symbols on their number chart.
Solution Steps
Step 1: List numbers in skip counting by 2: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20...
Step 2: List numbers in skip counting by 5: 5, 10, 15, 20, 25, 30...
Step 3: Find common numbers: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100