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

Starter quiz

  • Complete the missing word _______ − subtrahend = difference
    • difference
    • addend
    • minuend  ✓
    • subtrahend
  • What is the missing part in this bar model?
    What is the missing part in this bar model?
    • '30' ✓
  • Which of the pairs of numbers have a difference of 60?
    • 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?
    • 380 + 320 = 60
    • 320 = 380 − 60  ✓
    • 320 − 60 = 380
    • 380 = 320 − 60
  • Look at the number line. Which number is missing from the equation? 670 − 150 = <span class="blank">______</span>
    Look at the number line. Which number is missing from the equation? 670 − 150 = ______
    • '520' ✓
  • Look at the number line. Which number is missing from the equation? 220 + <span class="blank">______</span> = 480
    Look at the number line. Which number is missing from the equation? 220 + ______ = 480
    • '260' ✓
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