--- title: "Yonjuu Math Game: Build Number Sense Through Play | Hattennoki" description: "Explore Yonjuu, the tactile math game by Hattennoki. Use visual cards to build number sense, master addition, and reduce math anxiety at home or school." canonical: https://mytribe.in/hattennoki/professional-development-educational-workshops/yonjuu-the-math-game-for-everyone last_updated: 2025-09-02 --- # Yonjuu: Build Math Confidence Through Play Tribe Verified · Used in classrooms and homes across India. By [Hattennoki](https://mytribe.in/hattennoki) · Online; Workshops in Bengaluru & across India · ₹1,800 per participant (estimate) Part of [Professional Development & Educational Workshops](https://mytribe.in/hattennoki/professional-development-educational-workshops). [View full gallery](https://mytribe.in/hattennoki/professional-development-educational-workshops/gallery) Yonjuu is a tactile card game designed to make numbers visible. From basic addition to complex algebra, I created this tool to help learners see, touch, and understand the logic behind math, removing the fear of rote memorization. ## Photos and videos - [Video: My son Kai and I demonstrate how to play Level 1 of Yonjuu, a math card game I created. This video shows the core of my philosophy: making learning a fun, engaging, and collaborative experience for families. The game is designed to build number sense and strategic thinking in a playful way.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/f9d98bfa-0438-4960-a2b0-aad6d5d9a6bb) - [Video: This video provides a step-by-step tutorial for my math game, Yonjuu. I created it to transform abstract concepts into a tangible, strategic card game that strengthens number sense and logical reasoning for learners of all ages.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/cc31e3d4-4939-409f-8021-a1e28f22e19c) - [Video: A short video demonstrating how to use Yonjuu cards to visualize multiplication. Instead of memorizing tables, learners can see '4 times 3' as four groups of three, building deep conceptual understanding.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/2d7a6f72-a36a-4a02-9513-2943d433ea35) - [Video: This video explains how to use Yonjuu cards for addition and subtraction with numbers greater than five. The 'make a ten' strategy shown here is a powerful mental math technique that the visual cards help to solidify.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/1894053d-a227-4441-a21b-036481a1c8b4) - ![A glowing recommendation for Yonjuu from mathematician Dr. James Tanton. It's an honor to have my game recognized for its ability to build a strong foundation in arithmetic through fun and fluency practice.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/fe79e352-30da-42a0-8faf-005086c8c3ae) - ![A close-up of the Yonjuu game box and cards. I designed the packaging and cards to be tactile and visually appealing, making the learning experience enjoyable from the moment you open the box.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/b8d48699-9625-4cc6-8c1b-ad886407e975) - [Video: A video of a child using Yonjuu cards to learn 'partners of 5' (number combinations that add up to 5). This foundational skill is crucial for developing number sense and fluency in addition and subtraction.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/c4efe36d-6fd5-4af7-9988-cb8d53687da3) - [Video: A video showing a child using popsicle sticks to practice counting and bundling in groups of ten. This hands-on activity complements the use of Yonjuu cards to build a concrete understanding of place value.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/afa75206-3111-4bbd-89e4-04dcd27c2a16) - [Video: A video of a child practicing math fact fluency by making pairs of numbers that add up to five using Yonjuu cards. Consistent, playful practice is key to mastery.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/c8c1f4bf-d730-4d2a-a518-a0ae4001e3f3) - [Video: A video demonstrating a more advanced addition task with Yonjuu cards. Here, we move beyond simple pairs to adding multiple cards by visualizing and regrouping, a key step towards mental math proficiency.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/ddc1234f-4c38-4963-8ac5-92bd4b8041be) - [Video: A video showing a daily math routine using Yonjuu cards to build numbers up from five. This simple exercise strengthens understanding of number relationships and composition.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/2a95ae9d-66d0-451a-8b8b-baf78012722e) - [Video: A video of a child confidently identifying 'partners of 10' with Yonjuu cards. Mastering this skill is a game-changer for mental addition and subtraction.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/a442e569-6f1d-43a5-91b6-d06831aa7fb5) - [Video: A video of a child practicing making 'partners of 10' with Yonjuu cards. The visual ten-frame on each card makes it easy for children to see how many more are needed to complete a ten.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/63cf59f4-1080-4dbe-a660-3dcd023999fb) - [Video: A video montage showcasing the many uses of Yonjuu, from teaching basic number sense to algebra. It's used in homes, schools, and even corporate team-building, demonstrating its versatility.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/062a6b0c-97b1-421e-9900-03dbf781cb3f) - ![A fun Pi Day graphic I created using Yonjuu cards to represent the first 15 digits of pi. This shows how the cards can be used creatively to connect with different mathematical concepts.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/beab1d46-190c-4c6e-92db-133071179b55) - ![A Yonjuu Challenge for older students, using the cards to solve a quadratic equation. This demonstrates how the game's principles can be extended to advanced high school math topics.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/3cf369c4-795d-4618-a069-4ad07ee6e088) - [Video: A video showcasing a series of Yonjuu Challenges. These puzzles are designed to flex math muscles and encourage creative problem-solving for all ages.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/daf86989-3dab-4ca0-aa34-e04fcd7b56df) - ![A promotional graphic for my workshops, asking if you've ever heard someone say 'I am not a numbers person.' My goal with Yonjuu and my teaching methods is to change this mindset.](https://assets.mytribe.in/insecure/raw:1/plain/s3://mytribe-assets-production/b3d8e4f1-b54b-43b8-ab68-98e6bb6fb93f) ## About Yonjuu: The Math Game for Everyone Yonjuu isn't just another set of flashcards. It is a tool designed to fix the gap between abstract numbers and real understanding. When you hold these cards, you are not just reciting facts; you are seeing 'partners of 10' and visualizing magnitude through the ten-frame design on every card. Whether your child is struggling with basic addition or you are looking for a visual way to explain multiplication, these cards change the conversation from 'what is the answer' to 'how does this number work'. Math anxiety often comes from being forced to memorize rules before understanding the concept. I designed Yonjuu to reverse that experience. The deck uses a clean, ten-frame layout across four distinct colors to help learners see, touch, and group numbers. This approach is rooted in the Science of Reading and Math Sense methodologies. When a child sees the number eight on a card, they don't just see a digit. They see eight distinct shapes that need two more to complete a ten. This visual clarity helps build 'Number Sense,' which is the foundation for everything that comes later—from place value and skip counting to multiplication and even complex algebra. The game is incredibly versatile. We use it for: - Building addition and subtraction fluency (making pairs of 10 is a game-changer for early learners). - Visualizing multiplication as groups of objects rather than rote tables. - Developing critical thinking and logic through the core card game mechanics. Yonjuu works because it meets the learner where they are. Whether you are a parent sitting at the kitchen table helping with homework, or a teacher looking for a hands-on activity for a classroom of 30, the game provides a tangible way to build confidence. It takes the pressure off the 'right answer' and puts the focus on the pattern and the process. The game is designed for ages 3 and up, and we have variations for every stage of learning, ensuring that as your child grows, the game grows with them. ## About Hattennoki I'm Jaspreet. After years of teaching, I realized that kids don't need more worksheets; they need to hold ideas in their hands. I created Yonjuu because I wanted my own son and others to see math as a playground rather than a place to be afraid. 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