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Cornerstone Sep 8 - 14 25 questions
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Monday 8 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 6⁄10 + 1⁄10

    Answer: 7⁄10
  2. 2. Algebra

    Solve: 3x - 10 = 32

    Answer: x = 14
  3. 3. Geometry

    Calculate the hypotenuse when a = 6cm and b = 6cm

    Answer: 8.49cm
  4. 4. Ratio

    Divide 140 in the ratio 4:3:3

    Answer: 56, 42 and 42
  5. 5. Statistics

    Find the mean of: 14, 6, 5, 16, 9

    Answer: 10

Tuesday 9 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 3⁄7 + 1⁄4

    Answer: 19⁄28
  2. 2. Algebra

    Solve: 5x + 15 = 55

    Answer: x = 8
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 12cm and 16cm

    Answer: 20cm
  4. 4. Ratio

    Divide 52 in the ratio 1:2:1

    Answer: 13, 26 and 13
  5. 5. Statistics

    Calculate the mean of: 11, 8, 49, 30, 20, 36, 12

    Answer: 23.7

Wednesday 10 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄7 + 2⁄4

    Answer: 11⁄14
  2. 2. Algebra

    Solve: 5x + 6 = 51

    Answer: x = 9
  3. 3. Geometry

    Calculate the hypotenuse when a = 7cm and b = 9cm

    Answer: 11.4cm
  4. 4. Ratio

    Divide 104 in the ratio 3:2:3

    Answer: 39, 26 and 39
  5. 5. Statistics

    Calculate the mean of: 8, 31, 50, 17, 24, 18, 29

    Answer: 25.3

Thursday 11 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 1⁄6 + 4⁄6

    Answer: 5⁄6
  2. 2. Algebra

    Solve: 3x - 12 = 21

    Answer: x = 11
  3. 3. Geometry

    Calculate the hypotenuse when a = 8cm and b = 5cm

    Answer: 9.43cm
  4. 4. Ratio

    Divide 184 in the ratio 1:1:2

    Answer: 46, 46 and 92
  5. 5. Statistics

    Find the mean of: 8, 7, 10

    Answer: 8.3333333333333

Friday 12 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄3 + 3⁄5

    Answer: 19⁄15
  2. 2. Algebra

    Solve: 7x - 20 = 85

    Answer: x = 15
  3. 3. Geometry

    Calculate the hypotenuse when a = 8cm and b = 15cm

    Answer: 17cm
  4. 4. Ratio

    Divide 96 in the ratio 2:3:1

    Answer: 32, 48 and 16
  5. 5. Statistics

    Find the mean of: 12, 5, 17, 19

    Answer: 13.25