Addition and Subtraction — Year 3

• Column addition with regrouping

  Litnumia skill: Column addition with regrouping

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

• Column addition without regrouping

  Litnumia skill: Column addition without regrouping

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

• Column subtraction with regrouping

  Litnumia skill: Column subtraction with regrouping

  Taught as 'exchanging' with base-ten apparatus before the compact written method.

• Estimate and check calculations

  Litnumia skill: Estimate and check calculations

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

• Mental strategies with three-digit numbers

  Litnumia skill: Mental strategies with three-digit numbers

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