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Cornerstone Oct 26 - Nov 1 25 questions
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Monday 26 October 2026

Keystones #299 · Five questions · Open this day only

  1. 1. Number

    Calculate: 5 + -6 - -1

    Answer: 0
  2. 2. Algebra

    Find the nth term: 21, 18, 15, 12, ...

    Answer: 24 - 3n
  3. 3. Geometry

    Calculate the area of a circle with diameter 11cm

    Answer: 95.03cm²
  4. 4. Ratio

    A price falls from £130.00 to £98.00. Calculate the percentage decrease

    Answer: 24.6%
  5. 5. Statistics

    Find the median of: 20, 10, 14, 16, 7

    Answer: 14

Tuesday 27 October 2026

Keystones #300 · Five questions · Open this day only

  1. 1. Number

    Calculate: 3 × -5 + 0

    Answer: -15
  2. 2. Algebra

    Find the nth term rule for: 7, 9, 11, 13, ...

    Answer: 2n + 5
  3. 3. Geometry

    Find the area of a circle with radius 5cm

    Answer: 78.54cm²
  4. 4. Ratio

    A price falls from £380.00 to £317.00. Calculate the percentage decrease

    Answer: 16.6%
  5. 5. Statistics

    Calculate the median of: 40, 10, 26, 31, 26, 18

    Answer: 26

Wednesday 28 October 2026

Keystones #301 · Five questions · Open this day only

  1. 1. Number

    Calculate: -8 × -4 + -7

    Answer: 25
  2. 2. Algebra

    Find the nth term rule for: 8, 10, 12, 14, ...

    Answer: 2n + 6
  3. 3. Geometry

    Find the area of a circle with radius 7cm

    Answer: 153.94cm²
  4. 4. Ratio

    A price falls from £393.00 to £367.00. Calculate the percentage decrease

    Answer: 6.6%
  5. 5. Statistics

    Calculate the median of: 35, 15, 13, 19, 34, 18

    Answer: 18.5

Thursday 29 October 2026

Keystones #302 · Five questions · Open this day only

  1. 1. Number

    Calculate: -1 + 4 - 5

    Answer: -2
  2. 2. Algebra

    Find the nth term: 25, 21, 17, 13, ...

    Answer: 29 - 4n
  3. 3. Geometry

    Calculate the area of a circle with diameter 9cm

    Answer: 63.62cm²
  4. 4. Ratio

    A price falls from £486.00 to £133.00. Calculate the percentage decrease

    Answer: 72.6%
  5. 5. Statistics

    Find the median of: 10, 14, 6, 18, 18

    Answer: 14

Friday 30 October 2026

Keystones #303 · Five questions · Open this day only

  1. 1. Number

    Calculate: -7 + -9 - -2

    Answer: -14
  2. 2. Algebra

    Find the nth term: 15, 11, 7, 3, ...

    Answer: 19 - 4n
  3. 3. Geometry

    Find the area of a circle with radius 6cm

    Answer: 113.cm²
  4. 4. Ratio

    A price falls from £159.00 to £113.00. Calculate the percentage decrease

    Answer: 28.9%
  5. 5. Statistics

    Find the median of: 6, 5, 14, 10, 20

    Answer: 10