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Cornerstone Sep 22 - 28 25 questions
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Monday 22 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 4⁄5 + 3⁄4

    Answer: 31⁄20
  2. 2. Algebra

    Solve: 4x + 10 = 46

    Answer: x = 9
  3. 3. Geometry

    Calculate the hypotenuse when a = 6cm and b = 15cm

    Answer: 16.16cm
  4. 4. Ratio

    Share 66 in the ratio 1:2

    Answer: 22 and 44
  5. 5. Statistics

    Calculate the mean of: 15, 18, 11, 15, 15, 27

    Answer: 16.8

Tuesday 23 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 3⁄5 + 1⁄5

    Answer: 4⁄5
  2. 2. Algebra

    Solve: 4x - 9 = 51

    Answer: x = 15
  3. 3. Geometry

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

    Answer: 39cm
  4. 4. Ratio

    Share 60 in the ratio 4:1

    Answer: 48 and 12
  5. 5. Statistics

    Find the mean of: 13, 12, 4, 12

    Answer: 10.25

Wednesday 24 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 5⁄8 + 1⁄8

    Answer: 3⁄4
  2. 2. Algebra

    Solve: 4x - 12 = 16

    Answer: x = 7
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 3cm and 4cm

    Answer: 5cm
  4. 4. Ratio

    Divide 152 in the ratio 1:3:4

    Answer: 19, 57 and 76
  5. 5. Statistics

    Calculate the mean of: 32, 48, 16, 47, 44, 24

    Answer: 35.2

Thursday 25 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄8 + 1⁄4

    Answer: 1⁄2
  2. 2. Algebra

    Solve: 6x + 4 = 22

    Answer: x = 3
  3. 3. Geometry

    Calculate the hypotenuse when a = 10cm and b = 12cm

    Answer: 15.62cm
  4. 4. Ratio

    Divide 135 in the ratio 3:2:4

    Answer: 45, 30 and 60
  5. 5. Statistics

    Find the mean of: 8, 11, 8

    Answer: 9

Friday 26 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 9⁄12 + 1⁄12

    Answer: 5⁄6
  2. 2. Algebra

    Solve: 7x + 9 = 93

    Answer: x = 12
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 15cm and 20cm

    Answer: 25cm
  4. 4. Ratio

    Divide 200 in the ratio 2:1:2

    Answer: 80, 40 and 80
  5. 5. Statistics

    Find the mean of: 5, 3, 9, 2

    Answer: 4.75