7: Advanced Multiplicative - Addition and Subtraction

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Josh and Sam are weighing themselves. Josh weighs 26.6 kilograms. Sam weighs 25.7 kilograms. What is their combined weight?

Student: Twenty six and twenty five makes fifty one. 0.6 and 0.7 makes 1.3. 51 and 1.3 makes 52.3 kilograms.

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Students at the Advanced Multiplicative stage are learning to choose appropriately from a range of part-whole strategies to solve and estimate the answers to problems involving multiplication and division. These strategies require one or more of the numbers involved in a multiplication or division to be partitioned, manipulated, then recombined.