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Cornerstone Oct 5 - 11 25 questions
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Monday 5 October 2026

Keystones #278 · Five questions · Open this day only

  1. 1. Number

    Find the HCF of 18 and 15

    Answer: 3
  2. 2. Algebra

    If x = 2, calculate x² + 6x + 8

    Answer: 24
  3. 3. Geometry

    Calculate the circumference of a circle with radius 6cm

    Answer: 37.7cm
  4. 4. Ratio

    What multiplier represents a 50% increase?

    Answer: 1.5
  5. 5. Statistics

    Find the mean, median and range of: 16, 26, 40, 19, 26

    Answer: Mean = 25.4, Median = 26, Range = 24

Tuesday 6 October 2026

Keystones #279 · Five questions · Open this day only

  1. 1. Number

    Find the HCF of 35 and 25

    Answer: 5
  2. 2. Algebra

    If x = 2, calculate x² + 6x + 7

    Answer: 23
  3. 3. Geometry

    Find the circumference of a circle with diameter 8cm

    Answer: 25.13cm
  4. 4. Ratio

    What multiplier represents a 10% increase?

    Answer: 1.1
  5. 5. Statistics

    Find the mean, median and range of: 21, 17, 37, 29, 21

    Answer: Mean = 25, Median = 21, Range = 20

Wednesday 7 October 2026

Keystones #280 · 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, find the value of 6x + 3

    Answer: 15
  3. 3. Geometry

    Calculate the circumference of a circle with radius 15cm

    Answer: 94.25cm
  4. 4. Ratio

    What multiplier represents a 33% decrease?

    Answer: 0.67
  5. 5. Statistics

    Find the mean, mode, median and range of: 30, 29, 37, 29, 20

    Answer: Mean = 29, Mode = 29, Median = 29, Range = 17

Thursday 8 October 2026

Keystones #281 · Five questions · Open this day only

  1. 1. Number

    What is the HCF of 30 and 45?

    Answer: 15
  2. 2. Algebra

    If x = 3, find the value of 2x + 8

    Answer: 14
  3. 3. Geometry

    Calculate the circumference of a circle with radius 3cm

    Answer: 18.85cm
  4. 4. Ratio

    What multiplier represents a 35% decrease?

    Answer: 0.65
  5. 5. Statistics

    Find the mean, mode, median and range of: 45, 20, 20, 22, 47

    Answer: Mean = 30.8, Mode = 20, Median = 22, Range = 27

Friday 9 October 2026

Keystones #282 · Five questions · Open this day only

  1. 1. Number

    Find the HCF of 4 and 10

    Answer: 2
  2. 2. Algebra

    If x = 4, calculate x² + 2x + 3

    Answer: 27
  3. 3. Geometry

    Find the circumference of a circle with diameter 16cm

    Answer: 50.27cm
  4. 4. Ratio

    What multiplier represents a 28% decrease?

    Answer: 0.72
  5. 5. Statistics

    Find the mean, median and range of: 22, 20, 40, 31, 25

    Answer: Mean = 27.6, Median = 25, Range = 20