Starter quiz

  • A number that has exactly 2 factors is a ______ number.
    • 'prime' ✓
  • Which of the following will be less than 20?
    • {2}\over{5} \times20  ✓
    • {20}\times1 {{1} \over {3}}
    • {6}\over{5} \times20
    • {20}\times{19\over20}  ✓
  • {2}\over{3} × {1}\over{8}is ______ than {2}\over{3} × {1}\over{9}.
    • 'greater' ✓
  • Using this fact, {8}\over{85} × {25}\over{140} = {100}\over{5950}, which of the following are true?
    • {2}\over{85} × {25}\over{140} = {20}\over{5950}
    • {4}\over{85} × {25}\over{140} = {50}\over{5950}  ✓
    • {16}\over{85} × {25}\over{140} = {200}\over{5950}  ✓
    • {20}\over{85} × {25}\over{140} = {250}\over{5950}  ✓
  • Calculate {2}\over{3} × {3}\over{4} × 15. Give your answer as a mixed number.
    • {15}\over{2}
    • {90}\over{12}
    • 6 {{1} \over {2}}
    • 7 {{1} \over {2}}  ✓
  • Calculate {132}\over{385} × {15}\over{18} by writing each numerator and denominator as a product of its prime factors.
    • {2}\over{7}  ✓
    • {3}\over{7}
    • {5}\over{7}
    • {6}\over{7}
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