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Cornerstone Aug 31 - Sep 6 25 questions
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Monday 31 August 2026

Keystones #243 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄7 + 3⁄7

    Answer: 5⁄7
  2. 2. Algebra

    Solve: 3x + 11 = 29

    Answer: x = 6
  3. 3. Geometry

    Calculate the hypotenuse when a = 4cm and b = 10cm

    Answer: 10.77cm
  4. 4. Ratio

    Divide 144 in the ratio 1:3:4

    Answer: 18, 54 and 72
  5. 5. Statistics

    Find the mean of: 5, 12, 16, 18

    Answer: 12.75

Tuesday 1 September 2026

Keystones #244 · Five questions · Open this day only

  1. 1. Number

    Calculate: 8⁄11 + 1⁄11

    Answer: 9⁄11
  2. 2. Algebra

    Solve: 3x + 5 = 17

    Answer: x = 4
  3. 3. Geometry

    Calculate the hypotenuse when a = 4cm and b = 8cm

    Answer: 8.94cm
  4. 4. Ratio

    Divide 117 in the ratio 4:2:3

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

    Calculate the mean of: 22, 6, 27, 37, 49, 45, 20, 21

    Answer: 28.4

Wednesday 2 September 2026

Keystones #245 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄4 + 2⁄3

    Answer: 7⁄6
  2. 2. Algebra

    Solve: 6x + 12 = 84

    Answer: x = 12
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 7cm and 24cm

    Answer: 25cm
  4. 4. Ratio

    Divide 168 in the ratio 2:1:1

    Answer: 84, 42 and 42
  5. 5. Statistics

    Calculate the mean of: 17, 47, 44, 21, 29, 40, 32, 14

    Answer: 30.5

Thursday 3 September 2026

Keystones #246 · Five questions · Open this day only

  1. 1. Number

    Calculate: 5⁄8 + 1⁄8

    Answer: 3⁄4
  2. 2. Algebra

    Solve: 2x - 9 = 9

    Answer: x = 9
  3. 3. Geometry

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

    Answer: 6.4cm
  4. 4. Ratio

    Divide 196 in the ratio 2:4:1

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

    Find the mean of: 20, 9, 11, 3, 4

    Answer: 9.4

Friday 4 September 2026

Keystones #247 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄6 + 3⁄6

    Answer: 5⁄6
  2. 2. Algebra

    Solve: 6x - 10 = 50

    Answer: x = 10
  3. 3. Geometry

    Calculate the hypotenuse when a = 6cm and b = 11cm

    Answer: 12.53cm
  4. 4. Ratio

    Share 39 in the ratio 2:1

    Answer: 26 and 13
  5. 5. Statistics

    Calculate the mean of: 8, 36, 15, 36, 39, 34, 21

    Answer: 27