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Cornerstone Sep 7 - 13 25 questions
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Monday 7 September 2026

Keystones #250 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2 × -1 + -5

    Answer: -7
  2. 2. Algebra

    Find the nth term rule for: 14, 19, 24, 29, ...

    Answer: 5n + 9
  3. 3. Geometry

    Calculate the area of a circle with diameter 24cm

    Answer: 452.39cm²
  4. 4. Ratio

    A value increases from 157 to 254. What is the percentage change?

    Answer: 61.8%
  5. 5. Statistics

    Calculate the median of: 27, 28, 21, 34, 34, 27

    Answer: 27.5

Tuesday 8 September 2026

Keystones #251 · Five questions · Open this day only

  1. 1. Number

    Calculate: -5 × 5 + -7

    Answer: -32
  2. 2. Algebra

    Find the nth term rule for: 6, 8, 10, 12, ...

    Answer: 2n + 4
  3. 3. Geometry

    Calculate the area of a circle with diameter 21cm

    Answer: 346.36cm²
  4. 4. Ratio

    A value increases from 173 to 242. What is the percentage change?

    Answer: 39.9%
  5. 5. Statistics

    Calculate the median of: 12, 36, 13, 10, 16, 10

    Answer: 12.5

Wednesday 9 September 2026

Keystones #252 · Five questions · Open this day only

  1. 1. Number

    Calculate: 4 + 5 - 10

    Answer: -1
  2. 2. Algebra

    Find the nth term: 30, 25, 20, 15, ...

    Answer: 35 - 5n
  3. 3. Geometry

    Find the area of a circle with radius 9cm

    Answer: 254.47cm²
  4. 4. Ratio

    A value increases from 114 to 171. What is the percentage change?

    Answer: 50%
  5. 5. Statistics

    Find the median of: 12, 18, 6, 17, 15

    Answer: 15

Thursday 10 September 2026

Keystones #253 · Five questions · Open this day only

  1. 1. Number

    Calculate: 5 + 3 - 7

    Answer: 1
  2. 2. Algebra

    Find the nth term: 9, 3, -3, -9, ...

    Answer: 15 - 6n
  3. 3. Geometry

    Calculate the area of a circle with diameter 22cm

    Answer: 380.13cm²
  4. 4. Ratio

    A value increases from 79 to 167. What is the percentage change?

    Answer: 111.4%
  5. 5. Statistics

    Find the median of: 6, 18, 10, 20, 8

    Answer: 10

Friday 11 September 2026

Keystones #254 · Five questions · Open this day only

  1. 1. Number

    Calculate: -7 × 1 + -8

    Answer: -15
  2. 2. Algebra

    Find the nth term rule for: 7, 12, 17, 22, ...

    Answer: 5n + 2
  3. 3. Geometry

    Find the area of a circle with radius 3cm

    Answer: 28.27cm²
  4. 4. Ratio

    A value increases from 77 to 121. What is the percentage change?

    Answer: 57.1%
  5. 5. Statistics

    Calculate the median of: 24, 24, 14, 11, 26, 24

    Answer: 24