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Cornerstone Jan 5 - 11 25 questions
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Monday 5 January 2026

Keystones #5 · Five questions · Open this day only

  1. 1. Number

    Calculate: -5 × -5 + -7

    Answer: 18
  2. 2. Algebra

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

    Answer: 2n + 6
  3. 3. Geometry

    Calculate the area of a circle with diameter 12cm

    Answer: 113.cm²
  4. 4. Ratio

    A value increases from 77 to 105. What is the percentage change?

    Answer: 36.4%
  5. 5. Statistics

    Calculate the median of: 30, 11, 33, 11, 36, 10

    Answer: 20.5

Tuesday 6 January 2026

Keystones #6 · Five questions · Open this day only

  1. 1. Number

    Calculate: -7 + 2 - -9

    Answer: 4
  2. 2. Algebra

    Find the nth term rule for: 13, 16, 19, 22, ...

    Answer: 3n + 10
  3. 3. Geometry

    Find the area of a circle with radius 8cm

    Answer: 201.06cm²
  4. 4. Ratio

    A value increases from 174 to 242. What is the percentage change?

    Answer: 39.1%
  5. 5. Statistics

    Calculate the median of: 14, 34, 32, 22, 13, 29

    Answer: 25.5

Wednesday 7 January 2026

Keystones #7 · Five questions · Open this day only

  1. 1. Number

    Calculate: -8 × 0 + -8

    Answer: -8
  2. 2. Algebra

    Find the nth term: 30, 28, 26, 24, ...

    Answer: 32 - 2n
  3. 3. Geometry

    Calculate the area of a circle with diameter 16cm

    Answer: 201.06cm²
  4. 4. Ratio

    A value increases from 95 to 164. What is the percentage change?

    Answer: 72.6%
  5. 5. Statistics

    Find the median of: 17, 18, 20, 13, 6

    Answer: 17

Thursday 8 January 2026

Keystones #8 · Five questions · Open this day only

  1. 1. Number

    Calculate: -1 × 3 + -4

    Answer: -7
  2. 2. Algebra

    Find the nth term: 15, 12, 9, 6, ...

    Answer: 18 - 3n
  3. 3. Geometry

    Calculate the area of a circle with diameter 11cm

    Answer: 95.03cm²
  4. 4. Ratio

    A value increases from 66 to 133. What is the percentage change?

    Answer: 101.5%
  5. 5. Statistics

    Find the median of: 10, 10, 9, 14, 16

    Answer: 10

Friday 9 January 2026

Keystones #9 · Five questions · Open this day only

  1. 1. Number

    Calculate: -9 + -7 - -9

    Answer: -7
  2. 2. Algebra

    Find the nth term rule for: 3, 5, 7, 9, ...

    Answer: 2n + 1
  3. 3. Geometry

    Find the area of a circle with radius 5cm

    Answer: 78.54cm²
  4. 4. Ratio

    A value increases from 61 to 117. What is the percentage change?

    Answer: 91.8%
  5. 5. Statistics

    Calculate the median of: 34, 21, 35, 13, 13, 10

    Answer: 17