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Cornerstone Dec 22 - 28 25 questions
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Monday 22 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 411 + 411

    Answer: 811
  2. 2. Algebra

    Solve: 8x - 18 = 70

    Answer: x = 11
  3. 3. Geometry

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

    Answer: 10.82cm
  4. 4. Ratio

    Divide 104 in the ratio 1:1:2

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

    Find the mean of: 13, 19, 12

    Answer: 14.666666666667

Tuesday 23 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 25 + 57

    Answer: 3935
  2. 2. Algebra

    Solve: 4x + 7 = 43

    Answer: x = 9
  3. 3. Geometry

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

    Answer: 25cm
  4. 4. Ratio

    Divide 153 in the ratio 2:3:4

    Answer: 34, 51 and 68
  5. 5. Statistics

    Calculate the mean of: 34, 8, 21, 47, 10, 11

    Answer: 21.8

Wednesday 24 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 13 + 27

    Answer: 1321
  2. 2. Algebra

    Solve: 2x + 8 = 22

    Answer: x = 7
  3. 3. Geometry

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

    Answer: 13cm
  4. 4. Ratio

    Share 75 in the ratio 4:1

    Answer: 60 and 15
  5. 5. Statistics

    Find the mean of: 19, 4, 16, 18, 4

    Answer: 12.2

Thursday 25 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 812 + 312

    Answer: 1112
  2. 2. Algebra

    Solve: 5x - 6 = 64

    Answer: x = 14
  3. 3. Geometry

    Calculate the hypotenuse when a = 10cm and b = 5cm

    Answer: 11.18cm
  4. 4. Ratio

    Share 27 in the ratio 1:2

    Answer: 9 and 18
  5. 5. Statistics

    Calculate the mean of: 34, 6, 38, 22, 44, 19, 32, 14

    Answer: 26.1

Friday 26 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 14 + 28

    Answer: 12
  2. 2. Algebra

    Solve: 3x - 5 = 22

    Answer: x = 9
  3. 3. Geometry

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

    Answer: 29cm
  4. 4. Ratio

    Share 55 in the ratio 3:2

    Answer: 33 and 22
  5. 5. Statistics

    Calculate the mean of: 18, 50, 42, 37, 49, 9, 47, 38

    Answer: 36.3