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Cornerstone Jul 14 - 20 25 questions
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Monday 14 July 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 4⁄6 + 3⁄4

    Answer: 17⁄12
  2. 2. Algebra

    Solve: 8x - 14 = 18

    Answer: x = 4
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 12cm and 35cm

    Answer: 37cm
  4. 4. Ratio

    Divide 140 in the ratio 1:4:2

    Answer: 20, 80 and 40
  5. 5. Statistics

    Find the mean of: 3, 2, 15, 4

    Answer: 6

Tuesday 15 July 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 6⁄8 + 1⁄8

    Answer: 7⁄8
  2. 2. Algebra

    Solve: 4x + 15 = 27

    Answer: x = 3
  3. 3. Geometry

    Calculate the hypotenuse when a = 7cm and b = 6cm

    Answer: 9.22cm
  4. 4. Ratio

    Divide 120 in the ratio 3:2:3

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

    Calculate the mean of: 33, 25, 45, 10, 11, 17, 40, 30

    Answer: 26.4

Wednesday 16 July 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 1⁄5 + 4⁄7

    Answer: 27⁄35
  2. 2. Algebra

    Solve: 2x + 15 = 35

    Answer: x = 10
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 8cm and 15cm

    Answer: 17cm
  4. 4. Ratio

    Divide 140 in the ratio 2:2:3

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

    Calculate the mean of: 43, 16, 11, 27, 28, 6, 13

    Answer: 20.6

Thursday 17 July 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 3⁄9 + 1⁄9

    Answer: 4⁄9
  2. 2. Algebra

    Solve: 7x - 18 = 17

    Answer: x = 5
  3. 3. Geometry

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

    Answer: 10.82cm
  4. 4. Ratio

    Divide 153 in the ratio 4:1:4

    Answer: 68, 17 and 68
  5. 5. Statistics

    Find the mean of: 10, 3, 12, 8, 6

    Answer: 7.8

Friday 18 July 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄5 + 1⁄5

    Answer: 3⁄5
  2. 2. Algebra

    Solve: 5x - 14 = 36

    Answer: x = 10
  3. 3. Geometry

    Calculate the hypotenuse when a = 5cm and b = 4cm

    Answer: 6.4cm
  4. 4. Ratio

    Divide 220 in the ratio 1:2:2

    Answer: 44, 88 and 88
  5. 5. Statistics

    Find the mean of: 9, 2, 3, 13

    Answer: 6.75