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Cornerstone Feb 5 - 11 25 questions
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Monday 2 February 2026

Keystones #33 · Five questions · Open this day only

  1. 1. Number

    What is 2 × 3 × 5?

    Answer: 30
  2. 2. Algebra

    Solve: 9x = 36

    Answer: x = 4
  3. 3. Geometry

    Calculate the hypotenuse when a = 9cm and b = 4cm

    Answer: 9.85cm
  4. 4. Ratio

    Find 78% of 99

    Answer: 77.22
  5. 5. Statistics

    Find the range of: 38, 37, 11, 12, 26

    Answer: 27

Tuesday 3 February 2026

Keystones #34 · Five questions · Open this day only

  1. 1. Number

    Calculate: 52 + 84

    Answer: 52 + 84 = 136
  2. 2. Algebra

    Factorise: 30x + 10

    Answer: 5(6x + 2)
  3. 3. Geometry

    Find the perimeter of a right triangle with sides 5cm and 12cm

    Answer: 30cm
  4. 4. Ratio

    Find 16% of 266

    Answer: 42.56
  5. 5. Statistics

    Calculate the mean of: 15, 41, 17, 19, 43, 29, 18, 18

    Answer: 25

Wednesday 4 February 2026

Keystones #35 · Five questions · Open this day only

  1. 1. Number

    Calculate: 1⁄9 + 7⁄9

    Answer: 8⁄9
  2. 2. Algebra

    Solve: x + 14 = 17

    Answer: x = 3
  3. 3. Geometry

    Opposite = 5cm, hypotenuse = 5.8cm. Find the angle

    Answer: 60° (approximately)
  4. 4. Ratio

    Simplify the ratio 30:15

    Answer: 2:1
  5. 5. Statistics

    Find the mean of: 9, 15, 7, 14, 9

    Answer: 10.8

Thursday 5 February 2026

Keystones #36 · Five questions · Open this day only

  1. 1. Number

    Simplify: x6 × x4

    Answer: x10
  2. 2. Algebra

    Expand: 5(4x + 8)

    Answer: 20x + 40
  3. 3. Geometry

    Calculate the perimeter of a right triangle with sides 7cm and 8cm

    Answer: 25.6cm
  4. 4. Ratio

    Simplify the ratio 6:24

    Answer: 1:4
  5. 5. Statistics

    Calculate the mean of: 13, 50, 14, 24, 25, 17

    Answer: 23.8

Friday 6 February 2026

Keystones #37 · Five questions · Open this day only

  1. 1. Number

    Calculate: 5⁄11 + 2⁄11

    Answer: 7⁄11
  2. 2. Algebra

    What is the next term? 6, 24, 96, 384, ...

    Answer: 1536
  3. 3. Geometry

    Opposite = 13cm, hypotenuse = 15cm. Find the angle

    Answer: 60° (approximately)
  4. 4. Ratio

    Simplify the ratio 8:24

    Answer: 1:3
  5. 5. Statistics

    Calculate the mean of: 26, 15, 40, 43, 39, 23, 33

    Answer: 31.3