The Reading Strategies Book 2.0
Jennifer Serravallo
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View on Amazon →Math Instruction for K-3: Number Sense to Fluency
Develop conceptual understanding and computational fluency using the Concrete-Pictorial-Abstract progression, number talks, and NCTM effective practices.
Number Sense: The Foundation
Number sense is the foundational mathematics competency—understanding quantity, relationships between numbers, and how numbers are used. Students with strong number sense can estimate, decompose numbers, and solve problems flexibly. Research by NCTM (2014) and Boaler (2015) shows that number sense, not speed or rote memorization, predicts long-term math success.
In K-3, building number sense means students can count meaningfully, understand one-to-one correspondence, recognize quantities without counting (subitizing), and understand part-whole relationships. A kindergartener who sees 7 dots and instantly knows "that's seven" without counting has number sense. A first grader who recognizes 7 as 5 + 2 understands part-whole relationships. These are critical building blocks for addition and subtraction fluency.
The Concrete-Pictorial-Abstract (CPA) Progression
Bruner's (1966) CPA framework explains how students develop mathematical understanding. Every concept should be taught through all three modes:
Concrete (Manipulatives)
Students use physical objects. To teach addition, use counters, blocks, or bears. "Let's show 3 + 2. Put down 3 bears. Put down 2 more bears. How many altogether?" Students touch, move, and manipulate. This grounds abstract math in physical reality.
Pictorial (Drawings & Diagrams)
Students draw or see diagrams. "We have 3 bears and 2 bears. Let me draw circles for bears. Three circles here, two circles here. Count all the circles." Drawings bridge concrete and abstract. They're less cumbersome than manipulatives but still visual.
Abstract (Symbols & Numerals)
Students work with numbers and symbols. "3 + 2 = 5. We write this way to show: three, plus sign, two, equals, five." Only after concrete and pictorial understanding should students work primarily with numerals. Moving too quickly to abstract (just giving worksheets with numbers) confuses students who lack conceptual understanding.
Progression: Teach a concept with manipulatives first. Once students understand concretely, introduce drawings. Finally, introduce symbols. Don't rush the progression; some students need weeks at the concrete stage. Moving through CPA takes time, but conceptual understanding prevents gaps.
Core K-3 Math Instructional Practices
Subitizing
Instantly recognizing quantity without counting. Flash cards showing 2–5 items; students say the number without counting. Subitizing is a skill that develops with practice. It's foundational to number recognition and builds automaticity. Flash daily for 2 min during a math routine.
Number Talks
Brief (10 min), whole-group conversations about math. Teacher shows a problem (often visually or verbally). Students solve mentally, then share strategies. "Show me with your fingers how many you see" or "Tell your partner your answer. How did you solve it?" Number talks build flexible thinking, not just one right way.
Counting Strategies vs. Derived Facts
Initially, students count on fingers or count all. "2 + 3: count 1, 2, 3, 4, 5." As they develop, they use counting strategies: counting on (start at 2, count 3, 4, 5) or derived facts (knowing 2 + 2 = 4, so 2 + 3 = 5). Don't rush memorization; derived facts through strategy use are stronger.
Math Fluency vs. Speed
Fluency means knowing facts with accuracy, efficiency, and flexibility. It's not speed-racing. A fluent first grader knows 3 + 2 = 5, can use the fact in different contexts, and can explain their thinking. This is different from speed-drills, which often increase anxiety. Build fluency through practice with meaning, not rote memorization.
Math Centers & Practice
Practice should be varied and game-based, not drill worksheets. Use math games, dice games, card games, and manipulative activities. Games motivate practice, make thinking visible, and build number sense. A game where students roll two dice, add, and move uses the same facts as a worksheet but with engagement and joy.
Formative Assessment in Math
Check understanding frequently. Observe during number talks and games. Ask students to show their thinking with manipulatives or drawings. "Can you show me 5 using fingers and cubes?" Formative data guides grouping and next lessons. Don't wait for quizzes; assess daily through observation.
NCTM Principles for Effective Teaching of Mathematics
The National Council of Teachers of Mathematics (2014) identified core principles. Applied to K-3:
1. Establish Mathematical Goals to Focus Learning
Know what you're teaching and why. "Today's goal is for students to understand that 5 can be broken into 2 + 3 or 4 + 1 (part-whole relationships)." This focus prevents scattered teaching. Every lesson should have a clear mathematical goal.
2. Implement Tasks That Promote Reasoning and Problem-Solving
Don't use disconnected drill problems. Use contextualized tasks. "We have 8 crayons. 5 are red and some are blue. How many are blue?" This task uses subtraction in context, requires reasoning, and develops understanding. Open-ended tasks (multiple ways to solve) are better than closed tasks (only one right answer).
3. Use and Connect Mathematical Representations
Have students move between concrete, pictorial, and abstract. Use multiple representations (cubes, drawings, numbers, word problems). Students who see math in multiple ways develop deeper understanding and can use the representation that makes most sense for them.
4. Facilitate Meaningful Mathematical Discourse
Have students explain their thinking. "How did you solve this?" "Why does that strategy work?" Ask follow-up questions. Listen to student explanations to understand their reasoning. Discourse builds mathematical thinking and community.
5. Pose Purposeful Questions
Ask questions that provoke thinking, not just questions to check if they got it right. "Why is 3 + 2 the same as 2 + 3?" or "Can you show me a different way to make 7?" Questions promote reasoning and reveal misconceptions.
Why This Works: Conceptual Understanding & Mindset
Concrete-Pictorial-Abstract Progression (Bruner, 1966): Students need to build understanding through concrete experience before abstraction makes sense. A student who manipulates blocks to understand addition develops a mental model of the operation. When they later see "3 + 2 = 5," they can visualize blocks and understand the notation. Skipping concrete and pictorial stages leaves students confused and reliant on memorization.
Math Mindset & Growth (Boaler, 2015): Students' beliefs about math—whether they think they're "math people" or not—significantly impact performance. Fixed mindset ("I'm not good at math") leads to avoidance and poor outcomes. Growth mindset ("I can learn math; it takes effort") leads to perseverance and success. Praise effort, not ability. Celebrate mistakes as learning opportunities. Use language like "You haven't learned this yet" instead of "You can't do it."
NCTM Effective Practices (2014): Research shows students taught with these principles develop stronger conceptual understanding, better problem-solving, and more positive attitudes toward mathematics. The principles move away from procedural teaching ("Here's how you add") toward conceptual, reasoning-based teaching where students understand the why.
Building Fluency Without Anxiety
Math anxiety is real and harmful. Timed tests, speed drills, and comparison to peers increase anxiety, especially for girls and students of color. Instead: use games for practice (engaging, less pressure). Celebrate errors as learning. Use manipulatives so students feel confident. Provide frequent opportunities to succeed. A student who feels supported and capable develops fluency naturally; a student who feels pressured and compared develops anxiety.
Fluency should be built through varied, meaningful practice, not repetitive worksheets or timed tests. A game where students roll dice, add, and move is mathematical practice that builds facts and joy, not anxiety.
Research Backing
- Bruner, J. S. (1966). Toward a Theory of Instruction. Harvard University Press. Foundational theory of the Concrete-Pictorial-Abstract progression; explains how learners move from concrete manipulation to abstract representation.
- National Council of Teachers of Mathematics. (2014). Principles to Actions: Ensuring Mathematical Success for All. NCTM. Evidence-based practices for effective mathematics teaching; includes focus on reasoning, discourse, and meaningful tasks.
- Clements, D. H., & Sarama, J. (2014). Learning and Teaching Early Math: The Learning Trajectories Approach. Routledge. Research on early mathematics learning progressions; informs scope and sequence for K-3.
- Boaler, J. (2015). Mathematical Mindsets: Unleashing Students' Potential Through Creative Mathematics, Inspiring Messages and Innovative Teaching. Jossey-Bass. Research on growth mindset in mathematics; emphasizes problem-solving and productive struggle.
- Gersten, R., & Clarke, B. (2007). Effective Strategies for Teaching Students With Mathematics Difficulties. ERIC Digest, 1–2. Evidence-based practices for struggling mathematics learners; emphasizes concrete representations and explicit instruction.
Related Resources
- Instruction & Lesson Execution — Overview of math instruction methods
- Teaching Word Problem Solving in K-3 — Apply mathematical thinking to problem-solving
- Formative Assessment & Checking for Understanding in K-3 — Assess math understanding in real time
- Classroom Systems — Setting up math centers and routines
- Resource Library — Subitizing cards, number talk cards, and game templates
Get Math Instruction Resources
Download subitizing flash cards, number talk prompts, CPA lesson templates, and game ideas from the Resource Library.
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