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Maths
Informal and mental strategies for adding and subtracting two 3-digit numbers

Starter quiz

  • What is an addend?
    • An addend is a number multiplied by a number.
    • An addend is a number added to another.  ✓
    • An addend is a number subtracted from another.
  • What should you add to 70 to make 100?
    • '30' ✓
  • What would you add to 92 to make 100?
    • '8' ✓
  • 92 + 14 = ______
    • '106' ✓
  • ______ = 107 − 9
    • '98' ✓
  • The bucket balance has been filled with marbles and blocks. It is balanced. Which of these most closely represent the equation shown by the bucket balance?
    The bucket balance has been filled with marbles and blocks. It is balanced. Which of these most closely represent the equation shown by the bucket balance?
    • 2 + 2 = 2 + 2
    • 2 + 3 = 2 + 3
    • 2 + 3 = 4 + 1  ✓
    • 3 + 2 = 1 + 4  ✓
    • 3 + 3 = 2 + 4
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