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Cornerstone Aug 17 - 23 25 questions
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Monday 17 August 2026

Keystones #229 · Five questions · Open this day only

  1. 1. Number

    What is the HCF of 24 and 36?

    Answer: 12
  2. 2. Algebra

    If x = 4, find the value of 3x + 12

    Answer: 24
  3. 3. Geometry

    Find the circumference of a circle with diameter 9cm

    Answer: 28.27cm
  4. 4. Ratio

    What multiplier represents a 17% decrease?

    Answer: 0.83
  5. 5. Statistics

    Find the mean, median and range of: 33, 33, 28, 23, 20

    Answer: Mean = 27.4, Median = 28, Range = 13

Tuesday 18 August 2026

Keystones #230 · Five questions · Open this day only

  1. 1. Number

    What is the HCF of 20 and 30?

    Answer: 10
  2. 2. Algebra

    If x = 8, find the value of 4x + 9

    Answer: 41
  3. 3. Geometry

    Find the circumference of a circle with diameter 18cm

    Answer: 56.55cm
  4. 4. Ratio

    What multiplier represents a 18% decrease?

    Answer: 0.82
  5. 5. Statistics

    Find the mean, median and range of: 14, 33, 25, 26, 34

    Answer: Mean = 26.4, Median = 26, Range = 20

Wednesday 19 August 2026

Keystones #231 · Five questions · Open this day only

  1. 1. Number

    Find the HCF of 15 and 21

    Answer: 3
  2. 2. Algebra

    If x = 4, calculate x² + 3x + 2

    Answer: 30
  3. 3. Geometry

    Calculate the circumference of a circle with radius 4cm

    Answer: 25.13cm
  4. 4. Ratio

    What multiplier represents a 16% decrease?

    Answer: 0.84
  5. 5. Statistics

    Find the mean, mode, median and range of: 26, 31, 33, 33, 29

    Answer: Mean = 30.4, Mode = 33, Median = 31, Range = 7

Thursday 20 August 2026

Keystones #232 · Five questions · Open this day only

  1. 1. Number

    Find the HCF of 24 and 24

    Answer: 3
  2. 2. Algebra

    If x = 3, calculate x² + 4x + 8

    Answer: 29
  3. 3. Geometry

    Calculate the circumference of a circle with radius 3cm

    Answer: 18.85cm
  4. 4. Ratio

    What multiplier represents a 33% decrease?

    Answer: 0.67
  5. 5. Statistics

    Find the mean, median and range of: 17, 18, 30, 30, 33

    Answer: Mean = 25.6, Median = 30, Range = 16

Friday 21 August 2026

Keystones #233 · Five questions · Open this day only

  1. 1. Number

    Find the HCF of 6 and 10

    Answer: 2
  2. 2. Algebra

    If x = 4, find the value of 5x + 5

    Answer: 25
  3. 3. Geometry

    Calculate the circumference of a circle with radius 8cm

    Answer: 50.27cm
  4. 4. Ratio

    What multiplier represents a 25% decrease?

    Answer: 0.75
  5. 5. Statistics

    Find the mean, mode, median and range of: 22, 37, 34, 38, 34

    Answer: Mean = 33, Mode = 34, Median = 34, Range = 16