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  5. 6: Advanced Additive - Addition and Subtraction

6: Advanced Additive - Addition and Subtraction

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There are 121 students at Sarah's school. Sixty-six of them are girls. How many are boys?

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Student: One hundred and twenty-one minus sixty is sixty-one. Sixty-one minus six is fifty-five.

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Students at the Advanced Additive stage are learning to choose appropriately from a repertoire of part-whole strategies. They see numbers as whole units in themselves but also understand that “nested” within these units is a range of possibilities for subdivision and recombining.