Skip Counting by 25s (186)

Teaching Notes

Skip counting by 25s builds crucial number sense, strengthens pattern recognition, and lays the groundwork for multiplication. It is also vital for understanding money values, especially with quarters, and telling time.

Vocabulary

Skip counting: Counting by a given number.

Pattern: A repeating or predictable sequence.

Common Mistakes

• Forgetting the pattern when crossing 100s (e.g., 75, 100, 105 instead of 125).
• Errors when adding 25 to numbers ending in 50 or 75, leading to incorrect tens or hundreds place.
• Missing numbers in the sequence.
• Incorrectly adding 25 (e.g., 50, 80 instead of 50, 75).
• Losing track of the sequence when numbers get larger.

Differentiation

Discussion Questions

• Where do we see numbers counted by 25s in real life?
• What pattern do you notice in the last two digits of the numbers when counting by 25s?
• How is counting by 25s similar to counting by 5s or 10s?
• What patterns do you notice when you count by 25s?
• How is counting by 25s similar to or different from counting by 5s or 10s?
• When might you use skip counting by 25s in everyday life?

Extension Activities

• Count by 25s on a clock.
• Use play money.
• Number line jumps.

Parent Tip

Use coins: count groups of 4 quarters to make a dollar.

Skill Cluster

Number Sense & Operations

Estimated Time

15 minutes

Skills Practiced

Prerequisites

• Counting by 5s
• Counting by 10s
• Basic addition within 100
• Place value understanding
• Counting by 5s and 10s

Next Steps

• Multiplication facts for 25
• Counting money (quarters and mixed coins)
• Solving word problems involving multiples of 25
• Telling time to the nearest quarter hour
• Multiplication by 25
• Counting money (quarters)
• Problem-solving with skip counting