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Cornerstone Jun 29 - Jul 5 25 questions
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Monday 29 June 2026

Keystones #180 · Five questions · Open this day only

  1. 1. Number

    What is the HCF of 24 and 36?

    Answer: 12
  2. 2. Algebra

    If x = 2, calculate x² + 2x + 3

    Answer: 11
  3. 3. Geometry

    Calculate the circumference of a circle with radius 4cm

    Answer: 25.13cm
  4. 4. Ratio

    What multiplier represents a 19% decrease?

    Answer: 0.81
  5. 5. Statistics

    Find the mean, median and range of: 37, 31, 23, 17, 25

    Answer: Mean = 26.6, Median = 25, Range = 20

Tuesday 30 June 2026

Keystones #181 · Five questions · Open this day only

  1. 1. Number

    Find the HCF of 25 and 30

    Answer: 5
  2. 2. Algebra

    If x = 2, calculate x² + 2x + 2

    Answer: 10
  3. 3. Geometry

    Find the circumference of a circle with diameter 7cm

    Answer: 21.99cm
  4. 4. Ratio

    What multiplier represents a 18% decrease?

    Answer: 0.82
  5. 5. Statistics

    Find the mean, median and range of: 18, 27, 38, 29, 19

    Answer: Mean = 26.2, Median = 27, Range = 20

Wednesday 1 July 2026

Keystones #182 · Five questions · Open this day only

  1. 1. Number

    Find the HCF of 32 and 28

    Answer: 4
  2. 2. Algebra

    If x = 7, find the value of 3x + 8

    Answer: 29
  3. 3. Geometry

    Calculate the circumference of a circle with radius 10cm

    Answer: 62.83cm
  4. 4. Ratio

    What multiplier represents a 39% decrease?

    Answer: 0.61
  5. 5. Statistics

    Find the mean, median and range of: 29, 15, 29, 38, 18

    Answer: Mean = 25.8, Median = 29, Range = 23

Thursday 2 July 2026

Keystones #183 · Five questions · Open this day only

  1. 1. Number

    What is the HCF of 30 and 45?

    Answer: 15
  2. 2. Algebra

    If x = 8, find the value of 5x + 10

    Answer: 50
  3. 3. Geometry

    Find the circumference of a circle with diameter 4cm

    Answer: 12.57cm
  4. 4. Ratio

    What multiplier represents a 30% decrease?

    Answer: 0.7
  5. 5. Statistics

    Find the mean, median and range of: 18, 29, 20, 32, 14

    Answer: Mean = 22.6, Median = 20, Range = 18

Friday 3 July 2026

Keystones #184 · Five questions · Open this day only

  1. 1. Number

    Find the HCF of 24 and 8

    Answer: 4
  2. 2. Algebra

    If x = 4, calculate x² + 6x + 8

    Answer: 48
  3. 3. Geometry

    Calculate the circumference of a circle with radius 8cm

    Answer: 50.27cm
  4. 4. Ratio

    What multiplier represents a 20% increase?

    Answer: 1.2
  5. 5. Statistics

    Find the mean, mode, median and range of: 32, 36, 32, 44, 16

    Answer: Mean = 32, Mode = 32, Median = 32, Range = 28