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Cornerstone Sep 1 - 7 25 questions
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Monday 1 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 26 + 45

    Answer: 1715
  2. 2. Algebra

    Solve: 5x + 5 = 60

    Answer: x = 11
  3. 3. Geometry

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

    Answer: 10cm
  4. 4. Ratio

    Share 85 in the ratio 1:4

    Answer: 17 and 68
  5. 5. Statistics

    Find the mean of: 9, 6, 8, 4, 11

    Answer: 7.6

Tuesday 2 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 16 + 46

    Answer: 56
  2. 2. Algebra

    Solve: 4x + 5 = 21

    Answer: x = 4
  3. 3. Geometry

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

    Answer: 16.97cm
  4. 4. Ratio

    Share 40 in the ratio 3:1

    Answer: 30 and 10
  5. 5. Statistics

    Find the mean of: 10, 3, 5

    Answer: 6

Wednesday 3 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 57 + 45

    Answer: 5335
  2. 2. Algebra

    Solve: 6x - 18 = 30

    Answer: x = 8
  3. 3. Geometry

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

    Answer: 25cm
  4. 4. Ratio

    Share 72 in the ratio 2:1

    Answer: 48 and 24
  5. 5. Statistics

    Calculate the mean of: 16, 18, 10, 45, 27, 14, 29, 38

    Answer: 24.6

Thursday 4 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 56 + 57

    Answer: 6542
  2. 2. Algebra

    Solve: 4x - 7 = 53

    Answer: x = 15
  3. 3. Geometry

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

    Answer: 29cm
  4. 4. Ratio

    Divide 196 in the ratio 2:1:4

    Answer: 56, 28 and 112
  5. 5. Statistics

    Find the mean of: 12, 13, 10, 6

    Answer: 10.25

Friday 5 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 611 + 211

    Answer: 811
  2. 2. Algebra

    Solve: 6x + 9 = 51

    Answer: x = 7
  3. 3. Geometry

    Calculate the hypotenuse when a = 12cm and b = 8cm

    Answer: 14.42cm
  4. 4. Ratio

    Divide 230 in the ratio 4:3:3

    Answer: 92, 69 and 69
  5. 5. Statistics

    Calculate the mean of: 46, 21, 40, 35, 43, 49

    Answer: 39