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Cornerstone Feb 23 - Mar 1 25 questions
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Monday 23 February 2026

Keystones #54 · Five questions · Open this day only

  1. 1. Number

    Calculate: 5 × -1 + 3

    Answer: -2
  2. 2. Algebra

    Find the nth term: 18, 15, 12, 9, ...

    Answer: 21 - 3n
  3. 3. Geometry

    Calculate the area of a circle with diameter 16cm

    Answer: 201.06cm²
  4. 4. Ratio

    A value increases from 164 to 209. What is the percentage change?

    Answer: 27.4%
  5. 5. Statistics

    Find the median of: 16, 10, 13, 16, 17

    Answer: 16

Tuesday 24 February 2026

Keystones #55 · Five questions · Open this day only

  1. 1. Number

    Calculate: -1 × -3 + -5

    Answer: -2
  2. 2. Algebra

    Find the nth term: 13, 10, 7, 4, ...

    Answer: 16 - 3n
  3. 3. Geometry

    Calculate the area of a circle with diameter 12cm

    Answer: 113.cm²
  4. 4. Ratio

    A price falls from £162.00 to £100.00. Calculate the percentage decrease

    Answer: 38.3%
  5. 5. Statistics

    Calculate the median of: 31, 26, 28, 36, 26, 37

    Answer: 29.5

Wednesday 25 February 2026

Keystones #56 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2 + 8 - 10

    Answer: 0
  2. 2. Algebra

    Find the nth term rule for: 11, 13, 15, 17, ...

    Answer: 2n + 9
  3. 3. Geometry

    Find the area of a circle with radius 4cm

    Answer: 50.27cm²
  4. 4. Ratio

    A price falls from £412.00 to £111.00. Calculate the percentage decrease

    Answer: 73.1%
  5. 5. Statistics

    Find the median of: 18, 14, 18, 12, 7

    Answer: 14

Thursday 26 February 2026

Keystones #57 · Five questions · Open this day only

  1. 1. Number

    Calculate: -4 × 1 + -5

    Answer: -9
  2. 2. Algebra

    Find the nth term rule for: 14, 20, 26, 32, ...

    Answer: 6n + 8
  3. 3. Geometry

    Calculate the area of a circle with diameter 20cm

    Answer: 314.16cm²
  4. 4. Ratio

    A price falls from £492.00 to £430.00. Calculate the percentage decrease

    Answer: 12.6%
  5. 5. Statistics

    Find the median of: 12, 11, 10, 18, 5

    Answer: 11

Friday 27 February 2026

Keystones #58 · Five questions · Open this day only

  1. 1. Number

    Calculate: -9 + -6 - -2

    Answer: -13
  2. 2. Algebra

    Find the nth term: 34, 30, 26, 22, ...

    Answer: 38 - 4n
  3. 3. Geometry

    Find the area of a circle with radius 9cm

    Answer: 254.47cm²
  4. 4. Ratio

    A price falls from £205.00 to £71.00. Calculate the percentage decrease

    Answer: 65.4%
  5. 5. Statistics

    Calculate the median of: 38, 29, 27, 31, 33, 21

    Answer: 30