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Cornerstone Jun 11 - 17 25 questions
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Monday 15 June 2026

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    440000

    Answer: 4.4 × 105
  2. 2. Algebra

    Collect like terms: 4x + 4y + 6x + 8y

    Answer: 10x + 12y
  3. 3. Geometry

    Opposite = 7cm, hypotenuse = 14cm. Find the angle

    Answer: 30° (approximately)
  4. 4. Ratio

    Simplify the ratio 8:10

    Answer: 4:5
  5. 5. Statistics

    Find the mean of: 2, 14, 9, 11, 20

    Answer: 11.2

Tuesday 16 June 2026

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 31 + 79

    Answer: 31 + 79 = 110
  2. 2. Algebra

    Factorise: 8x² + 2x

    Answer: 2x(4x + 1)
  3. 3. Geometry

    Calculate the distance between (1, 4) and (4, 8)

    Answer: 5
  4. 4. Ratio

    Simplify the ratio 16:12

    Answer: 4:3
  5. 5. Statistics

    Find the range of: 16, 5, 13, 9, 5

    Answer: 11

Wednesday 17 June 2026

Keystones #2 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 97 + ? = 165

    Answer: 68
  2. 2. Algebra

    Simplify: 6x + 4x

    Answer: 10x
  3. 3. Geometry

    Opposite = 6cm, hypotenuse = 12cm. Find the angle

    Answer: 30° (approximately)
  4. 4. Ratio

    Simplify the ratio 10:12

    Answer: 5:6
  5. 5. Statistics

    A bag has 4 red and 3 blue balls. What is the probability of picking a red ball?

    Answer: 4⁄7

Thursday 18 June 2026

Keystones #3 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 42 + ? = 100

    Answer: 58
  2. 2. Algebra

    Factorise: 20x + 40

    Answer: 5(4x + 8)
  3. 3. Geometry

    Opposite = 9cm, hypotenuse = 10.4cm. Find the angle

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

    Simplify the ratio 18:24

    Answer: 3:4
  5. 5. Statistics

    Calculate the mean of: 34, 16, 21, 16, 23, 28

    Answer: 23

Friday 19 June 2026

Keystones #4 · Five questions · Open this day only

  1. 1. Number

    Calculate: 53 + 72

    Answer: 53 + 72 = 125
  2. 2. Algebra

    Factorise: 3x² + 8x

    Answer: x(3x + 8)
  3. 3. Geometry

    Opposite = 16cm, adjacent = 14cm. Calculate the angle

    Answer: 48.8°
  4. 4. Ratio

    Calculate 10% of 78

    Answer: 7.8
  5. 5. Statistics

    Find the mean of: 15, 12, 9, 15

    Answer: 12.75