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

Starter quiz

  • What is the missing whole in this bar model?
    What is the missing whole in this bar model?
    • '100' ✓
  • Complete the missing word minuend − subtrahend = __________
    • difference  ✓
    • addend
    • minuend
    • sum
  • Use a find the difference strategy to calculate: 72 − 65 = ______
    • '7' ✓
  • What is the difference between the two values shown?
    What is the difference between the two values shown?
    • '70' ✓
  • Use a partitioning strategy to calculate 690 − 270 = ______
    • '420' ✓
  • Which of the pairs of numbers have the smallest difference?
    • 270 and 290  ✓
    • 230 and 310
    • 260 and 320
    • 250 and 280
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