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One Less to 20

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Practice Subtracting One in This Kindergarten Math Lesson

In this interactive kindergarten math lesson, students will practice subtracting one from numbers up to 20. Learning the concept of “one less” is an essential early math skill that builds a strong foundation for subtraction and number sense. By working with numbers in a visual and engaging format, young learners begin to recognize patterns, count backward, and understand how subtraction works in everyday situations. This fun and focused lesson helps students feel confident working with small numbers as they build early math fluency.

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Engaging Online Learning Perfect for Classwork, Homework, or Extra Practice

This educational game is designed to keep kindergarteners actively engaged while learning how to subtract one. Whether used for classwork, homework, or independent online learning, the lesson provides immediate feedback and cheerful animations to support skill practice. It’s perfect for math centers, small group instruction, or early finishers looking for extra review. This interactive lesson blends foundational math practice with a kid-friendly learning environment that supports success in early elementary teaching.

Build Number Sense Through Standards-Aligned Subtraction Practice

Aligned with kindergarten math standards, this subtracting one lesson gives students a meaningful opportunity to build number sense, counting skills, and basic subtraction understanding. Teachers can pair this online lesson with hands-on manipulatives, number lines, or real-world counting activities for added reinforcement. By practicing “one less” in multiple ways, students develop a solid grasp of subtraction that will support them as they move on to more complex operations in future grades. This lesson is a great addition to any early math curriculum.

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Level

This interactive math lesson is categorized as Level K. It may be best suited for kindergarten students.

Common Core Standard

K.OA.1, MA.K.NSO.2.1, MA.K.NSO.2.3, V, MA.K.AR.2.1, K.3A
Operations And Algebraic Thinking

Understand Addition As Putting Together And Adding To, And Under- Stand Subtraction As Taking Apart And Taking From.
Represent addition and subtraction with objects, fingers, mental images, drawings2, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations.

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One Less to 10 (Level K)
Subtract one from single-digit numbers. (examples: 9-1 and 3-1) A silly cartoon character dances and jumps when kids answer correctly.

Subtracting Zero Within 10 (Level K)
In this math game, kids will subtract zero from single-digit numbers. (examples: 5-0 & 7-0) A funny cartoon character dances and cheers when they answer right.