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Cornerstone Dec 1 - 7 25 questions
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Monday 1 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 37 + 17

    Answer: 47
  2. 2. Algebra

    Solve: 2x - 16 = 10

    Answer: x = 13
  3. 3. Geometry

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

    Answer: 39cm
  4. 4. Ratio

    Divide 112 in the ratio 1:4:3

    Answer: 14, 56 and 42
  5. 5. Statistics

    Calculate the mean of: 31, 13, 25, 10, 46, 8, 14, 25

    Answer: 21.5

Tuesday 2 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 78 + 27

    Answer: 6556
  2. 2. Algebra

    Solve: 5x - 20 = 10

    Answer: x = 6
  3. 3. Geometry

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

    Answer: 11.4cm
  4. 4. Ratio

    Divide 120 in the ratio 3:1:2

    Answer: 60, 20 and 40
  5. 5. Statistics

    Calculate the mean of: 17, 38, 41, 47, 17, 36

    Answer: 32.7

Wednesday 3 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 19 + 69

    Answer: 79
  2. 2. Algebra

    Solve: 7x + 15 = 99

    Answer: x = 12
  3. 3. Geometry

    Calculate the hypotenuse when a = 5cm and b = 13cm

    Answer: 13.93cm
  4. 4. Ratio

    Divide 112 in the ratio 4:1:3

    Answer: 56, 14 and 42
  5. 5. Statistics

    Find the mean of: 6, 5, 12

    Answer: 7.6666666666667

Thursday 4 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 36 + 16

    Answer: 23
  2. 2. Algebra

    Solve: 2x + 13 = 35

    Answer: x = 11
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 6cm and 8cm

    Answer: 10cm
  4. 4. Ratio

    Share 60 in the ratio 2:3

    Answer: 24 and 36
  5. 5. Statistics

    Calculate the mean of: 17, 13, 6, 39, 32, 12, 9, 43

    Answer: 21.4

Friday 5 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 36 + 24

    Answer: 11
  2. 2. Algebra

    Solve: 4x - 17 = 31

    Answer: x = 12
  3. 3. Geometry

    Calculate the hypotenuse when a = 9cm and b = 4cm

    Answer: 9.85cm
  4. 4. Ratio

    Share 54 in the ratio 1:2

    Answer: 18 and 36
  5. 5. Statistics

    Find the mean of: 10, 12, 5, 7

    Answer: 8.5