Additive Reasoning and Mental Strategies · Operations

Mental Calculation Mastery

Using known facts to derive new ones and manipulating numbers mentally for speed and accuracy.

Key Questions

  1. 1How does knowing 3 plus 5 help us calculate 300 plus 500?
  2. 2What is the most efficient way to subtract 99 from a three digit number?
  3. 3Why might one person use partitioning while another uses rounding to solve the same mental sum?

National Curriculum Attainment Targets

KS2: Mathematics - Addition and Subtraction
Year: Year 3
Subject: Mathematics
Unit: Additive Reasoning and Mental Strategies
Period: Operations

Suggested Methodologies

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