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Number sense is the foundation of mathematical success. Students who develop strong number sense are better able to solve problems, recognize patterns, and apply efficient strategies when working with numbers.
As a math interventionist, I've found that small group instruction provides the perfect opportunity to strengthen number sense skills through hands-on activities and meaningful mathematical discussions.
Here are 10 number sense activities that I regularly use during intervention groups.
1. Quick Dot Images
Show students a dot image for 2–3 seconds and ask them how many dots they saw.
Encourage students to explain how they knew the quantity rather than simply counting each dot.
This activity helps students:
- Subitize quantities
- Recognize number patterns
- Build mental math skills
Classroom Tip: Ask students, "What did you see?" instead of "How many did you see?" to encourage deeper mathematical thinking.
2. Ten Frame Flash
Display a ten frame briefly and have students identify the quantity shown.
Ask students:
- How many dots did you see?
- How many more would make ten?
- How did you know?
Ten frames help students develop benchmark numbers and understand relationships within ten.
3. Build It, Draw It, Write It
Give students a number and ask them to:
- Build it with manipulatives
- Draw a representation
- Write the numeral
For example, students might represent 12 using linking cubes, draw 12 dots, and write the numeral 12.
This reinforces connections between concrete, pictorial, and abstract representations.
4. Number Talks
Present a simple computation problem and ask students to solve it mentally.
Examples:
- 8 + 7
- 15 - 9
- 19 + 4
Encourage multiple strategies and discuss how different students solved the problem.
Number talks help students develop flexibility and confidence with numbers.
5. More, Less, and Between
Write a number on a whiteboard and ask students:
- What is one more?
- What is one less?
- Which numbers come before and after?
As students improve, increase the challenge by asking for ten more or ten less.
This activity strengthens understanding of number relationships and place value.
6. Make Ten Challenge
Provide students with counters or linking cubes.
Give a number such as 7 and ask:
"How many more do you need to make ten?"
Students physically build the quantity and determine the missing amount.
This activity develops one of the most important mental math strategies for addition and subtraction.
7. Number Bond Practice
Use number bonds to help students see part-part-whole relationships.
Examples:
- 8 = 5 + 3
- 10 = 6 + 4
- 12 = 7 + 5
Ask students to find multiple combinations that create the same whole number.
Understanding number bonds helps students develop fluency and flexibility.
8. Compare and Explain
Present two numbers and ask students to compare them.
Example:
Which is greater: 27 or 32?
Students must explain their reasoning using mathematical language.
This activity supports place value understanding and mathematical communication.
9. Roll, Build, and Compare
Students roll dice to generate numbers.
After building the numbers with manipulatives, they compare:
- Greater than
- Less than
- Equal to
Students enjoy the game format while practicing important number concepts.
10. Target Number Challenge
Give students a target number such as 20.
Ask them to find as many combinations as possible that equal the target number.
Examples:
- 10 + 10
- 15 + 5
- 12 + 8
- 18 + 2
This activity encourages flexible thinking and reinforces number relationships.
My Go-To Tools for Number Sense
One of the tools I use most often during intervention groups is a magnetic ten frame. It allows students to visualize quantities, make ten, compare numbers, and develop efficient counting strategies.
Magnetic Ten Frame Set
Some of my other favorites include:
- Dry erase markers and whiteboards
- Two-color counters
- Linking cubes
These tools help students visualize mathematical concepts and actively participate during small group instruction.
If you're interested in seeing the supplies I use most often during intervention groups, check out my post on 5 Supplies Every Math Intervention Teacher Needs.
Final Thoughts
Developing strong number sense doesn't require complicated lessons or expensive materials. Consistent opportunities to explore numbers, discuss strategies, and engage in hands-on learning can make a significant difference for struggling learners.
These ten activities have become staples in my intervention groups because they encourage mathematical thinking while keeping students engaged.
Whether you're working with individual students, small groups, or an entire class, strengthening number sense is one of the best investments you can make in long-term mathematical success.
What are your favorite number sense activities? Share them in the comments below.

















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