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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?
    • '300' ✓
  • What is the difference between the two values shown?
    What is the difference between the two values shown?
    • '60' ✓
  • Which of the pairs of numbers have a difference of 30?
    • 270 and 290
    • 230 and 310
    • 260 and 320
    • 250 and 280  ✓
  • Which of these is the correct equation represented by this number line?
    Which of these is the correct equation represented by this number line?
    • 390 + 450 = 60
    • 390 − 60 = 450
    • 450 = 390 − 60
    • 390 = 450 − 60  ✓
  • Look at the number line. Which number is missing from the equation? 780 − <span class="blank">______</span> = 60
    Look at the number line. Which number is missing from the equation? 780 − ______ = 60
    • '720' ✓
  • Look at the number line. Which number is missing from the equation? <span class="blank">______</span> + 120 = 270
    Look at the number line. Which number is missing from the equation? ______ + 120 = 270
    • '150' ✓
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