Starter quiz

  • A prime number is an integer greater than one with exactly ______ factors.
    • '2' ✓
  • Which of the following products only use prime numbers?
    • 2 × 2 × 13  ✓
    • 2 × 6 × 13
    • 2 × 9 × 13
    • 2 × 3 × 5 × 17  ✓
  • Write 300 as a product of its prime factors.
    • 4 × 3 × 25
    • 2² × 3 × 5²  ✓
    • 4 × 3 × 5²
    • 2² × 3 × 25
    • 2² × 3 × 5
  • Use the fact that 60 = 2² × 3 × 5 to write 300 as a product of its prime factors.
    • 2² × 3² × 5
    • 2² × 3 × 5²  ✓
    • 2² × 3² × 5²
    • 2 × 3 × 5²
  • Use the fact that 60 = 2² × 3 × 5 to write 30 as a product of its prime factors.
    • 2² × 3 × 5 ÷ 2
    • 2 × 3 × 5  ✓
    • 2² × 5
    • 2 × 3 × 5²
  • If 52 = 2² × 13 and 175 = 5² × 7, which of the following is the most useful arrangement to calculate 175 × 52?
    • 2 × 2 × 13 × 5 × 5 × 7
    • 2 × 13 × 2 × 5 × 5 × 7
    • 2 × 5 × 2 × 5 × 13 × 7  ✓
    • 2 × 7 × 2 × 5 × 13 × 5
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