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Cornerstone Apr 13 - 19 25 questions
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Monday 13 April 2026

Keystones #103 · Five questions · Open this day only

  1. 1. Number

    Calculate: -2 + 6 - 2

    Answer: 2
  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 20cm

    Answer: 314.16cm²
  4. 4. Ratio

    A value increases from 116 to 179. What is the percentage change?

    Answer: 54.3%
  5. 5. Statistics

    Find the median of: 11, 6, 15, 9, 16

    Answer: 11

Tuesday 14 April 2026

Keystones #104 · Five questions · Open this day only

  1. 1. Number

    Calculate: -10 + -4 - 1

    Answer: -15
  2. 2. Algebra

    Find the nth term rule for: 7, 13, 19, 25, ...

    Answer: 6n + 1
  3. 3. Geometry

    Calculate the area of a circle with diameter 23cm

    Answer: 415.48cm²
  4. 4. Ratio

    A price falls from £412.00 to £376.00. Calculate the percentage decrease

    Answer: 8.7%
  5. 5. Statistics

    Calculate the median of: 29, 12, 34, 23, 26, 27

    Answer: 26.5

Wednesday 15 April 2026

Keystones #105 · Five questions · Open this day only

  1. 1. Number

    Calculate: 7 × 4 + -3

    Answer: 25
  2. 2. Algebra

    Find the nth term: 33, 31, 29, 27, ...

    Answer: 35 - 2n
  3. 3. Geometry

    Find the area of a circle with radius 10cm

    Answer: 314.16cm²
  4. 4. Ratio

    A price falls from £344.00 to £190.00. Calculate the percentage decrease

    Answer: 44.8%
  5. 5. Statistics

    Find the median of: 11, 14, 8, 9, 16

    Answer: 11

Thursday 16 April 2026

Keystones #106 · Five questions · Open this day only

  1. 1. Number

    Calculate: -5 + -5 - 0

    Answer: -10
  2. 2. Algebra

    Find the nth term: 20, 17, 14, 11, ...

    Answer: 23 - 3n
  3. 3. Geometry

    Calculate the area of a circle with diameter 11cm

    Answer: 95.03cm²
  4. 4. Ratio

    A price falls from £339.00 to £128.00. Calculate the percentage decrease

    Answer: 62.2%
  5. 5. Statistics

    Find the median of: 6, 12, 12, 19, 12

    Answer: 12

Friday 17 April 2026

Keystones #107 · Five questions · Open this day only

  1. 1. Number

    Calculate: 4 × 0 + 3

    Answer: 3
  2. 2. Algebra

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

    Answer: 3n + 1
  3. 3. Geometry

    Find the area of a circle with radius 6cm

    Answer: 113.cm²
  4. 4. Ratio

    A price falls from £344.00 to £169.00. Calculate the percentage decrease

    Answer: 50.9%
  5. 5. Statistics

    Calculate the median of: 19, 19, 28, 11, 37, 35

    Answer: 23.5