Starter quiz

  • __________ are the digits in a number that contribute to the accuracy of the number. The first significant figure is the first non-zero digit.
    • Estimated numbers
    • Important number
    • Real numbers
    • Significant figures  ✓
  • Which of the following are good, quick estimate calculations for 577 ÷ 19.57?
    • 580 ÷ 20  ✓
    • 600 ÷ 20  ✓
    • 580 ÷ 19.5
    • 600 ÷ 19.5
  • Which of the following are correct for {11.239\times3.12}\over{0.488}?
    • {11\times3} \over {0.5} = 16.5
    • {10\times3} \over {0.5} = 15
    • {11\times3} \over {0.5} = 66  ✓
    • {10\times3} \over {0.5} = 60  ✓
  • Match each calculation to its approximate answer.
    • \frac{9.8}{0.120}
      ⇔
      100 ✓
    • \frac{98}{0.111}
      ⇔
      1000 ✓
    • \frac{9.8}{0.2003}
      ⇔
      50 ✓
    • \frac{980}{0.199}
      ⇔
      5000 ✓
    • \frac{980}{0.498}
      ⇔
      2000 ✓
    • \frac{9}{0.51}
      ⇔
      18 ✓
  • A square plot of grass has a length of 7.88 m (2 d.p). Select the correct estimate for the area of the square grass plot.
    • 8 × 8 = 64 m²  ✓
    • 8 × 8 = 16 m²
    • 8 + 8 + 8 + 8 = 32 m²
    • 8 + 8 + 8 + 8 = 32 m
  • Izzy thinks of a number. Truncated to 1 s.f., it is 500. Rounded to the nearest 50, it is 600. It is multiple of 5 and a palindrome . All of its digits are prime numbers. Izzy's number is ______
    • '575' ✓
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