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Cornerstone Jun 25 - Jul 1 25 questions
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Monday 22 June 2026

Keystones #7 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 63 + ? = 192

    Answer: 129
  2. 2. Algebra

    Factorise: 30x + 40

    Answer: 5(6x + 8)
  3. 3. Geometry

    Opposite = 9cm, hypotenuse = 18cm. Find the angle

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

    Simplify the ratio 21:15

    Answer: 7:5
  5. 5. Statistics

    Find the mean of: 9, 10, 10, 10, 3

    Answer: 8.4

Tuesday 23 June 2026

Keystones #8 · Five questions · Open this day only

  1. 1. Number

    Calculate: 72 + 58

    Answer: 72 + 58 = 130
  2. 2. Algebra

    Expand: 3(5x + 7)

    Answer: 15x + 21
  3. 3. Geometry

    Opposite = 12cm, adjacent = 14cm. Calculate the angle

    Answer: 40.6°
  4. 4. Ratio

    Simplify the ratio 4:6

    Answer: 2:3
  5. 5. Statistics

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

    Answer: 1⁄2

Wednesday 24 June 2026

Keystones #9 · Five questions · Open this day only

  1. 1. Number

    Calculate: 31 + 50

    Answer: 31 + 50 = 81
  2. 2. Algebra

    Solve: 6x = 84

    Answer: x = 14
  3. 3. Geometry

    Calculate the area of a right triangle with perpendicular sides 9cm and 9cm

    Answer: 40.5cm²
  4. 4. Ratio

    Simplify: 10:8:6

    Answer: 5:4:3
  5. 5. Statistics

    Find the mean of: 11, 7, 14, 14

    Answer: 11.5

Thursday 25 June 2026

Keystones #10 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 66 + ? = 166

    Answer: 100
  2. 2. Algebra

    Solve: x + 12 = 27

    Answer: x = 15
  3. 3. Geometry

    Opposite = 12cm, hypotenuse = 13.9cm. Find the angle

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

    Simplify: 15:6:12

    Answer: 5:2:4
  5. 5. Statistics

    Calculate the mean of: 17, 9, 24, 46, 14, 19, 42, 21

    Answer: 24

Friday 26 June 2026

Keystones #11 · Five questions · Open this day only

  1. 1. Number

    Calculate: 25 + 48

    Answer: 25 + 48 = 73
  2. 2. Algebra

    Simplify: 7x + 8x

    Answer: 15x
  3. 3. Geometry

    Opposite = 10cm, adjacent = 15cm. Calculate the angle

    Answer: 33.7°
  4. 4. Ratio

    Simplify: 4:12:10

    Answer: 2:6:5
  5. 5. Statistics

    A bag has 4 red and 6 blue balls. What is the probability of picking a red ball?

    Answer: 2⁄5