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Cornerstone Feb 2 - 8 25 questions
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Monday 2 February 2026

Keystones #33 · Five questions · Open this day only

  1. 1. Number

    Find the HCF of 16 and 20

    Answer: 4
  2. 2. Algebra

    If x = 6, find the value of 8x + 10

    Answer: 58
  3. 3. Geometry

    Find the circumference of a circle with diameter 15cm

    Answer: 47.12cm
  4. 4. Ratio

    What multiplier represents a 19% decrease?

    Answer: 0.81
  5. 5. Statistics

    Find the mean, mode, median and range of: 28, 23, 23, 13, 43

    Answer: Mean = 26, Mode = 23, Median = 23, Range = 30

Tuesday 3 February 2026

Keystones #34 · Five questions · Open this day only

  1. 1. Number

    What is the HCF of 20 and 30?

    Answer: 10
  2. 2. Algebra

    If x = 3, calculate x² + 6x + 3

    Answer: 30
  3. 3. Geometry

    Find the circumference of a circle with diameter 18cm

    Answer: 56.55cm
  4. 4. Ratio

    What multiplier represents a 36% decrease?

    Answer: 0.64
  5. 5. Statistics

    Find the mean, median and range of: 20, 33, 22, 18, 38

    Answer: Mean = 26.2, Median = 22, Range = 20

Wednesday 4 February 2026

Keystones #35 · Five questions · Open this day only

  1. 1. Number

    What is the HCF of 12 and 18?

    Answer: 6
  2. 2. Algebra

    If x = 5, calculate x² + 3x + 3

    Answer: 43
  3. 3. Geometry

    Find the circumference of a circle with diameter 11cm

    Answer: 34.56cm
  4. 4. Ratio

    What multiplier represents a 15% decrease?

    Answer: 0.85
  5. 5. Statistics

    Find the mean, mode, median and range of: 29, 48, 20, 24, 20

    Answer: Mean = 28.2, Mode = 20, Median = 24, Range = 28

Thursday 5 February 2026

Keystones #36 · Five questions · Open this day only

  1. 1. Number

    Find the HCF of 16 and 24

    Answer: 4
  2. 2. Algebra

    If x = 3, find the value of 8x + 11

    Answer: 35
  3. 3. Geometry

    Find the circumference of a circle with diameter 20cm

    Answer: 62.83cm
  4. 4. Ratio

    What multiplier represents a 50% increase?

    Answer: 1.5
  5. 5. Statistics

    Find the mean, median and range of: 31, 22, 24, 10, 31

    Answer: Mean = 23.6, Median = 24, Range = 21

Friday 6 February 2026

Keystones #37 · Five questions · Open this day only

  1. 1. Number

    Find the HCF of 9 and 15

    Answer: 3
  2. 2. Algebra

    If x = 10, find the value of 2x + 9

    Answer: 29
  3. 3. Geometry

    Find the circumference of a circle with diameter 19cm

    Answer: 59.69cm
  4. 4. Ratio

    What multiplier represents a 10% increase?

    Answer: 1.1
  5. 5. Statistics

    Find the mean, median and range of: 34, 17, 30, 16, 34

    Answer: Mean = 26.2, Median = 30, Range = 18