True: Informal written methods should reflect students’ personal mental strategies for adding and subtracting numbers., Students’ personal methods will often develop in a unique sequence., Students’ efficient use of mental computation strategies remains the initial priority., Fluency with standard algorithms becomes crucial as students work with larger numbers and mental strategies become less efficient., False: Informal written methods can include drawings, diagrams but not words and symbols., Students’ informal written methods will be the same for every student, regardless of students’ age, the context for the computation, the size and nature of the numbers and the mental computation strategy used., Students should not be encouraged to share their personal strategies and written methods with other students.,

Key principles of written computation methods

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