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Cornerstone Sep 29 - Oct 5 25 questions
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Monday 29 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 6⁄9 + 1⁄9

    Answer: 7⁄9
  2. 2. Algebra

    Solve: 6x + 7 = 61

    Answer: x = 9
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 20cm and 21cm

    Answer: 29cm
  4. 4. Ratio

    Divide 189 in the ratio 1:2:4

    Answer: 27, 54 and 108
  5. 5. Statistics

    Find the mean of: 6, 5, 16

    Answer: 9

Tuesday 30 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄5 + 1⁄5

    Answer: 3⁄5
  2. 2. Algebra

    Solve: 6x + 11 = 71

    Answer: x = 10
  3. 3. Geometry

    Calculate the hypotenuse when a = 11cm and b = 13cm

    Answer: 17.03cm
  4. 4. Ratio

    Divide 144 in the ratio 2:1:3

    Answer: 48, 24 and 72
  5. 5. Statistics

    Find the mean of: 16, 19, 18, 12

    Answer: 16.25

Wednesday 1 October 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 9⁄11 + 1⁄11

    Answer: 10⁄11
  2. 2. Algebra

    Solve: 5x + 4 = 59

    Answer: x = 11
  3. 3. Geometry

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

    Answer: 12.73cm
  4. 4. Ratio

    Divide 168 in the ratio 2:3:1

    Answer: 56, 84 and 28
  5. 5. Statistics

    Calculate the mean of: 34, 36, 12, 42, 35, 29

    Answer: 31.3

Thursday 2 October 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 1⁄5 + 3⁄4

    Answer: 19⁄20
  2. 2. Algebra

    Solve: 7x + 8 = 85

    Answer: x = 11
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 15cm and 36cm

    Answer: 39cm
  4. 4. Ratio

    Divide 100 in the ratio 3:3:4

    Answer: 30, 30 and 40
  5. 5. Statistics

    Calculate the mean of: 22, 16, 7, 9, 10, 45, 34, 32

    Answer: 21.9

Friday 3 October 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 1⁄6 + 3⁄6

    Answer: 2⁄3
  2. 2. Algebra

    Solve: 8x - 10 = 54

    Answer: x = 8
  3. 3. Geometry

    Calculate the hypotenuse when a = 11cm and b = 15cm

    Answer: 18.6cm
  4. 4. Ratio

    Divide 144 in the ratio 4:4:1

    Answer: 64, 64 and 16
  5. 5. Statistics

    Find the mean of: 12, 6, 13, 14, 3

    Answer: 9.6