Year 1 Addition Within 20 Worksheets

These Year 1 addition within 20 worksheets help children build confidence with addition beyond 10. Addition within 20 is an important KS1 maths skill because it connects counting, number bonds, place value and early mental calculation strategies.

Children can use these worksheets to practise adding numbers, completing number sentences, solving missing number questions and using simple strategies such as counting on. The questions are designed to be printable and easy to use for home learning, classroom practice or extra revision.

Addition within 20 helps children extend their number fact knowledge and become more confident adding larger single-digit and teen numbers. It also prepares children for subtraction within 20 and more advanced mental maths.

Parents can use these worksheets for regular home practice after children are comfortable adding within 10. Children can complete a worksheet, check answers and talk through any questions where they needed to count carefully.

Teachers can use addition within 20 worksheets for fluency sessions, lesson starters, independent work or targeted support. Once children are secure with this topic, they can move on to subtraction within 20, number bonds to 20 and mixed addition and subtraction problems.