1st Grade Addition to 20 Worksheet | Missing Addends & Adding 3 Numbers

1st Grade Addition and Subtraction Within 20 Worksheets Bundle | Fact Fluency

Three worksheets on addition and subtraction within 10 and 20. The students are required to use their knowledge on addition within 10 to perform calculations with numbers within 10 and 20. The exercises require to perform additions and subtractions between numbers or find the missing number in given additions or subtractions. Solutions to all worksheets are included. **Engage your Key Stage 1 students with this ultimate, no-prep addition and subtraction maths worksheets bundle!** This high-quality, 3-resource collection is specifically designed to take students beyond simple counting and build true maths fact fluency up to 20. By combining rapid-fire practice, missing number logic, and a smart visual pattern-building layout, this bundle covers all your early arithmetic bases. Perfect for morning work, daily maths starters, homework, or small group intervention! **What is Included in This Bundle?** This bundle includes 3 separate worksheet packs, each complete with full step-by-step visual solution keys for every question: * **Pack 1: Addition Masterclass (With Missing Numbers & 3 Addends):** Features targeted sections to build deep operational knowledge. Students practice standard addition facts to 20, isolate missing unknowns in early algebraic boxes (e.g., 10 + __ = 16), and learn mental strategies by adding three digits concurrently (e.g., 10 + 2 + 3 = 15). * **Pack 2: Subtraction Masterclass (With Missing Numbers):** Moves students comfortably through subtracting from teen numbers. Features straightforward computational drills alongside missing number balance challenges to master unknown values at the start or middle of the calculation (e.g., 11 - __ = 10 and __ - 5 = 10). * **Pack 3: Mental Maths Bridges (Addition & Subtraction Connections):** A unique, column-based worksheet pack that shows students how smaller numbers link to larger numbers. Students solve a basic single-digit calculation (like 3 + 2 = 5 or 5 - 2 = 3) and immediately apply that exact pattern to solve teen equations (like 13 + 2 = 15 or 15 - 2 = 13). **Why Teachers Love This Resource** * **No Prep Required:** Just print the pages and your lesson plans are ready to go! * **Scaffolded Skill Progression:** The layout naturally climbs in difficulty, allowing for effortless classroom differentiation. * **Full Answer Keys Included:** Every resource comes with a beautifully clear, completed visual layout so you can mark in seconds or enable student self-correction. **Target Key Stages & Year Groups** This bundle is perfect for **Key Stage 1 (Year 1 and Year 2), and Lower Key Stage 2 (Year 3 Intervention)** students. **UK National Curriculum Aligned:** * **Year 1 Mathematics:** Add and subtract one-digit and two-digit numbers to 20, including zero; solve problems with missing numbers. * **Year 2 Mathematics:** Recall and use addition and subtraction facts to 20 fluently; add three one-digit numbers.