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Cornerstone Oct 20 - 26 25 questions
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Monday 20 October 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 7⁄10 + 1⁄10

    Answer: 4⁄5
  2. 2. Algebra

    Solve: 4x - 17 = 31

    Answer: x = 12
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 9cm and 12cm

    Answer: 15cm
  4. 4. Ratio

    Divide 189 in the ratio 2:4:1

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

    Calculate the mean of: 24, 33, 16, 30, 20, 41, 19, 20

    Answer: 25.4

Tuesday 21 October 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 3⁄5 + 2⁄7

    Answer: 31⁄35
  2. 2. Algebra

    Solve: 6x + 13 = 73

    Answer: x = 10
  3. 3. Geometry

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

    Answer: 17cm
  4. 4. Ratio

    Divide 250 in the ratio 4:3:3

    Answer: 100, 75 and 75
  5. 5. Statistics

    Find the mean of: 5, 13, 16

    Answer: 11.333333333333

Wednesday 22 October 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 8⁄10 + 1⁄10

    Answer: 9⁄10
  2. 2. Algebra

    Solve: 3x + 10 = 31

    Answer: x = 7
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 5cm and 12cm

    Answer: 13cm
  4. 4. Ratio

    Divide 70 in the ratio 1:3:1

    Answer: 14, 42 and 14
  5. 5. Statistics

    Find the mean of: 4, 12, 2, 20, 12

    Answer: 10

Thursday 23 October 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄5 + 1⁄6

    Answer: 17⁄30
  2. 2. Algebra

    Solve: 4x - 13 = 19

    Answer: x = 8
  3. 3. Geometry

    Calculate the hypotenuse when a = 6cm and b = 9cm

    Answer: 10.82cm
  4. 4. Ratio

    Divide 117 in the ratio 3:4:2

    Answer: 39, 52 and 26
  5. 5. Statistics

    Calculate the mean of: 7, 16, 35, 22, 9, 19, 5, 21

    Answer: 16.8

Friday 24 October 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 4⁄7 + 1⁄5

    Answer: 27⁄35
  2. 2. Algebra

    Solve: 2x - 8 = 8

    Answer: x = 8
  3. 3. Geometry

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

    Answer: 16.16cm
  4. 4. Ratio

    Share 51 in the ratio 1:2

    Answer: 17 and 34
  5. 5. Statistics

    Find the mean of: 3, 19, 4, 7

    Answer: 8.25