Mr. Lee's Learners

Number sense is the foundation of mathematical understanding. When students develop strong number sense, they are able to reason about numbers, recognize patterns, and apply efficient strategies when solving problems. However, many students who struggle in mathematics have underlying number sense gaps that continue to affect their learning as concepts become more complex. As a math interventionist, I've found that identifying and addressing these gaps can often lead to significant student growth. Here are five common number sense gaps that can impact math success and ideas for supporting students. Disclosure: As an Amazon Associate, I earn from qualifying purchases. This comes at no additional cost to you. Y ou can find all resources mentioned in this blog post by visiting my  Amazon Storefront . 

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.  These activities are particularly important for kindergarten and first grade groups that provide the foundation for future grades.   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 o...

If you're working with students who are still developing strong number sense, especially with numbers 0 through 20, double ten frame cards are an essential tool to add to your math instruction toolkit. Whether you teach kindergarten or early elementary students, these cards can help children make sense of quantities, subitize, and build a firm foundation in math fluency. This set of  Double Ten Frame Cards  to help students visualize numbers in different ways and increase their flexibility with composing and decomposing numbers. There are a total of 168 cards included in this resource with 8 cards of each number.  These cards are easy to prep, simple to use, and incredibly versatile! Why Use Double Ten Frames? Double ten frames help students: Understand numbers beyond 10 in a visual format See how numbers are composed (5 + 7 = 12) and decomposed (12 = 10 + 2) Develop fluency with addition and subtraction facts Build confidence in working with teen numbers Classroom & ...

For many of us, the words “timed test” still bring a rush of anxiety. Rows of facts, ticking clocks, and pressure to perform fast—this was the traditional approach to mastering math facts. As a teacher, I’ve seen how this method can cause unnecessary stress, especially for students who are still developing number sense. That’s why I’ve embraced a shift in my classroom: moving away from timed tests and toward strategy-based fluency. What Is Strategy-Based Fluency? Rather than memorizing isolated facts, students learn and apply strategies that help them understand how numbers work together. These strategies include: Counting on (e.g., for 3 + 2, start at 3 and count up two) Making ten (e.g., turning 8 + 5 into 10 + 3) Using doubles (e.g., knowing 6 + 6 helps with 6 + 7) Decomposing numbers (e.g., breaking apart 9 + 6 into 9 + 1 + 5) These are not just tricks—they're foundational ways to build number sense. When students understand these patterns and relation...

Understanding numbers—what they represent, how they relate, and how they can be composed or decomposed—is the foundation of early math success. That’s why I love using Domino and Dot Pattern Cards with my students. These simple, versatile tools pack a powerful punch when it comes to developing number sense, subitizing, and early addition skills. In this post, I’ll share how I use these cards in small group instruction and independent practice, plus how you can grab a set for your classroom! 🔍 What Are Domino and Dot Pattern Cards? These are printable cards that feature traditional domino patterns on one side and dot arrangements (like dice or ten-frame formats) on the other. They’re designed to help students: Recognize quantities without counting (subitizing) Compare and compose numbers Build fluency with addition and number bonds Strengthen visual number sense 🛠️ How I Use Them in the Classroom These cards are incredibly flexible. Here are some of my favori...

Mathematics is more than numbers and equations; it's a gateway to logical thinking, problem-solving, and critical reasoning. In the realm of elementary education, the concepts of number sense and the Make 10 addition strategy stand as pillars that fortify students' mathematical prowess. Let's delve into the importance of these concepts and how they shape the future of our young learners. Understanding Number Sense Number sense is the bedrock upon which mathematical understanding is built. It's not just about knowing numbers but comprehending their relationships, patterns, and significance. A child with strong number sense can fluidly maneuver through calculations, estimate quantities, and approach mathematical problems with confidence. The Magic Behind Make 10 Addition Strategy Enter the realm of Make 10 addition strategy, a simple yet transformative approach. Imagine this: when a student understands that numbers can be broken down into pairs that make 10 (like 3 + 7 or...