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

Starter quiz

  • What is the number pair to ten for 6?
    • '4' ✓
  • What is the number pair to 100 for 30?
    • '70' ✓
  • Each bundle contains ten straws. How many straws are there altogether?
    Each bundle contains ten straws. How many straws are there altogether?
    • '120' ✓
  • Match the units to their value.
    • 3 tens
      ⇔
      30 ✓
    • 6 tens
      ⇔
      60 ✓
    • 4 ones
      ⇔
      4 ✓
    • 10 tens
      ⇔
      100 ✓
  • Fill in the missing number in this sequence: 70, 80, 90, 100, ______, 120, 130, 140
    • '110' ✓
  • Fill in the missing number in this sequence: 170, 175, 180, 185, ______, 195, 200, 205
    • '190' ✓
+