Addition and Subtraction — Year 1

• Add and subtract within 10

  Litnumia skill: Add and subtract within 10

  Concrete–pictorial–abstract progression: bar models and number lines before formal columnar addition/subtraction with exchanging.

• Add and subtract within 20

  Litnumia skill: Add and subtract within 20

  Concrete–pictorial–abstract progression: bar models and number lines before formal columnar addition/subtraction with exchanging.

• Doubles and halves to 20

  Litnumia skill: Doubles and halves to 20

  Concrete–pictorial–abstract progression: bar models and number lines before formal columnar addition/subtraction with exchanging.

• Number bonds to 10

  Litnumia skill: Number bonds to 10

  Concrete–pictorial–abstract progression: bar models and number lines before formal columnar addition/subtraction with exchanging.