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Cornerstone Apr 6 - 12 25 questions
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Monday 6 April 2026

Keystones #96 · Five questions · Open this day only

  1. 1. Number

    Add: 3⁄8 + 6⁄7

    Answer: 69⁄56
  2. 2. Algebra

    Solve: 4x - 20 = 40

    Answer: x = 15
  3. 3. Geometry

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

    Answer: 10cm
  4. 4. Ratio

    Share 32 in the ratio 3:1

    Answer: 24 and 8
  5. 5. Statistics

    Find the mean of: 7, 17, 5, 17, 20

    Answer: 13.2

Tuesday 7 April 2026

Keystones #97 · Five questions · Open this day only

  1. 1. Number

    Calculate: 8⁄12 + 1⁄12

    Answer: 3⁄4
  2. 2. Algebra

    Solve: 5x + 4 = 39

    Answer: x = 7
  3. 3. Geometry

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

    Answer: 11.4cm
  4. 4. Ratio

    Share 108 in the ratio 1:2

    Answer: 36 and 72
  5. 5. Statistics

    Calculate the mean of: 46, 40, 41, 40, 38, 22, 31, 22

    Answer: 35

Wednesday 8 April 2026

Keystones #98 · Five questions · Open this day only

  1. 1. Number

    Calculate: 6⁄10 + 2⁄10

    Answer: 4⁄5
  2. 2. Algebra

    Solve: 7x + 14 = 77

    Answer: x = 9
  3. 3. Geometry

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

    Answer: 9.85cm
  4. 4. Ratio

    Share 52 in the ratio 3:1

    Answer: 39 and 13
  5. 5. Statistics

    Calculate the mean of: 45, 20, 10, 37, 50, 5, 11

    Answer: 25.4

Thursday 9 April 2026

Keystones #99 · Five questions · Open this day only

  1. 1. Number

    Add: 3⁄4 + 1⁄6

    Answer: 11⁄12
  2. 2. Algebra

    Solve: 3x - 12 = 33

    Answer: x = 15
  3. 3. Geometry

    Calculate the hypotenuse when a = 4cm and b = 15cm

    Answer: 15.52cm
  4. 4. Ratio

    Share 70 in the ratio 2:3

    Answer: 28 and 42
  5. 5. Statistics

    Find the mean of: 5, 19, 20

    Answer: 14.666666666667

Friday 10 April 2026

Keystones #100 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄4 + 5⁄7

    Answer: 17⁄14
  2. 2. Algebra

    Solve: 2x - 10 = 14

    Answer: x = 12
  3. 3. Geometry

    Calculate the hypotenuse when a = 9cm and b = 8cm

    Answer: 12.04cm
  4. 4. Ratio

    Share 66 in the ratio 1:2

    Answer: 22 and 44
  5. 5. Statistics

    Find the mean of: 8, 14, 9

    Answer: 10.333333333333