This collection of 21 digital curriculum resources focuses on assisting students to develop efficient and effective mental calculation strategies for performing additions and subtractions of two-, three- and four-digit whole numbers. It is organised in three categories: developing strategies - addition; developing strategies - subtraction; and applying strategies. The ten learning objects in the applying strategies section give students opportunities to practise addition and subtraction strategies by making their own problems or by using a game-like environment.
L111 The difference bar: generate easy subtractions
L112 The difference bar: generate hard subtractions
L99 The take-away bar: generate easy subtractions
L100 The take-away bar: generate hard subtractions
L9927 Thinking addition: 2-digit plus 1-digit: assessment
L110 The difference bar: make your own hard subtractions
L109 The difference bar: make your own easy subtractions
L97 The take-away bar: make your own easy subtractions
L98 The take-away bar: make your own hard subtractions
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This collection of 21 digital curriculum resources focuses on assisting students to develop efficient and effective mental calculation strategies for performing additions and subtractions of two-, three- and four-digit whole numbers. It is organised in three categories: developing strategies - addition; developing strategies - subtraction; and applying strategies. The ten learning objects in the applying strategies section give students opportunities to practise addition and subtraction strategies by making their own problems or by using a game-like environment.
