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Cornerstone Jul 9 - 15 25 questions
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Monday 6 July 2026

Keystones #21 · Five questions · Open this day only

  1. 1. Number

    Find the total of 106, 181, and 58

    Answer: 345
  2. 2. Algebra

    Solve: 8x = 32

    Answer: x = 4
  3. 3. Geometry

    Opposite = 19cm, adjacent = 11cm. Calculate the angle

    Answer: 59.9°
  4. 4. Ratio

    Simplify the ratio 8:32

    Answer: 1:4
  5. 5. Statistics

    Find the mean of: 5, 11, 13, 2

    Answer: 7.75

Tuesday 7 July 2026

Keystones #22 · Five questions · Open this day only

  1. 1. Number

    Calculate: 80 + 84

    Answer: 80 + 84 = 164
  2. 2. Algebra

    Solve: x + 4 = 15

    Answer: x = 11
  3. 3. Geometry

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

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

    Simplify the ratio 12:15

    Answer: 4:5
  5. 5. Statistics

    Calculate the mean of: 14, 30, 31, 32, 7, 43, 32

    Answer: 27

Wednesday 8 July 2026

Keystones #23 · Five questions · Open this day only

  1. 1. Number

    Calculate: 54 + 60

    Answer: 54 + 60 = 114
  2. 2. Algebra

    Simplify: 5x + 9x

    Answer: 14x
  3. 3. Geometry

    Opposite = 12cm, hypotenuse = 24cm. Find the angle

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

    Simplify the ratio 16:14

    Answer: 8:7
  5. 5. Statistics

    Calculate the mean of: 32, 11, 9, 32, 20, 34, 27, 40

    Answer: 25.6

Thursday 9 July 2026

Keystones #24 · Five questions · Open this day only

  1. 1. Number

    Add: 4⁄6 + 1⁄5

    Answer: 13⁄15
  2. 2. Algebra

    Factorise: 7x² + 5x

    Answer: x(7x + 5)
  3. 3. Geometry

    Opposite = 13cm, adjacent = 20cm. Calculate the angle

    Answer: 33°
  4. 4. Ratio

    Calculate 50% of 91

    Answer: 45.5
  5. 5. Statistics

    What is the probability of getting heads when flipping a fair coin?

    Answer: 1⁄2

Friday 10 July 2026

Keystones #25 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 81 + ? = 133

    Answer: 52
  2. 2. Algebra

    What is the next term? 8, 24, 72, 216, ...

    Answer: 648
  3. 3. Geometry

    Opposite = 7cm, hypotenuse = 9.9cm. Find the angle

    Answer: 45° (approximately)
  4. 4. Ratio

    Calculate 10% of 30

    Answer: 3
  5. 5. Statistics

    Find the mean of: 9, 9, 5, 17

    Answer: 10