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Cornerstone Jul 20 - 26 25 questions
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Monday 20 July 2026

Keystones #201 · Five questions · Open this day only

  1. 1. Number

    Calculate: -6 × 2 + 5

    Answer: -7
  2. 2. Algebra

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

    Answer: 38 - 4n
  3. 3. Geometry

    Calculate the area of a circle with diameter 12cm

    Answer: 113.cm²
  4. 4. Ratio

    A value increases from 196 to 259. What is the percentage change?

    Answer: 32.1%
  5. 5. Statistics

    Calculate the median of: 32, 14, 15, 38, 36, 14

    Answer: 23.5

Tuesday 21 July 2026

Keystones #202 · Five questions · Open this day only

  1. 1. Number

    Calculate: 8 + -10 - 6

    Answer: -8
  2. 2. Algebra

    Find the nth term rule for: 6, 10, 14, 18, ...

    Answer: 4n + 2
  3. 3. Geometry

    Find the area of a circle with radius 8cm

    Answer: 201.06cm²
  4. 4. Ratio

    A value increases from 182 to 255. What is the percentage change?

    Answer: 40.1%
  5. 5. Statistics

    Find the median of: 19, 8, 18, 13, 5

    Answer: 13

Wednesday 22 July 2026

Keystones #203 · Five questions · Open this day only

  1. 1. Number

    Calculate: 4 × -3 + 2

    Answer: -10
  2. 2. Algebra

    Find the nth term rule for: 12, 14, 16, 18, ...

    Answer: 2n + 10
  3. 3. Geometry

    Calculate the area of a circle with diameter 14cm

    Answer: 153.94cm²
  4. 4. Ratio

    A value increases from 173 to 185. What is the percentage change?

    Answer: 6.9%
  5. 5. Statistics

    Find the median of: 6, 17, 8, 9, 10

    Answer: 9

Thursday 23 July 2026

Keystones #204 · Five questions · Open this day only

  1. 1. Number

    Calculate: 10 + -9 - 0

    Answer: 1
  2. 2. Algebra

    Find the nth term: 33, 28, 23, 18, ...

    Answer: 38 - 5n
  3. 3. Geometry

    Find the area of a circle with radius 6cm

    Answer: 113.cm²
  4. 4. Ratio

    A value increases from 177 to 241. What is the percentage change?

    Answer: 36.2%
  5. 5. Statistics

    Calculate the median of: 25, 12, 11, 32, 37, 18

    Answer: 21.5

Friday 24 July 2026

Keystones #205 · Five questions · Open this day only

  1. 1. Number

    Calculate: 4 + -10 - 2

    Answer: -8
  2. 2. Algebra

    Find the nth term: 22, 20, 18, 16, ...

    Answer: 24 - 2n
  3. 3. Geometry

    Find the area of a circle with radius 4cm

    Answer: 50.27cm²
  4. 4. Ratio

    A price falls from £262.00 to £202.00. Calculate the percentage decrease

    Answer: 22.9%
  5. 5. Statistics

    Find the median of: 6, 11, 7, 13, 15

    Answer: 11