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Cornerstone Feb 16 - 22 25 questions
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Monday 16 February 2026

Keystones #47 · Five questions · Open this day only

  1. 1. Number

    Add: 1⁄5 + 4⁄8

    Answer: 7⁄10
  2. 2. Algebra

    Solve: 6x + 3 = 33

    Answer: x = 5
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 3cm and 4cm

    Answer: 5cm
  4. 4. Ratio

    Share 108 in the ratio 1:2

    Answer: 36 and 72
  5. 5. Statistics

    Calculate the mean of: 48, 15, 20, 18, 26, 39

    Answer: 27.7

Tuesday 17 February 2026

Keystones #48 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄5 + 2⁄5

    Answer: 4⁄5
  2. 2. Algebra

    Solve: 2x - 13 = -1

    Answer: x = 6
  3. 3. Geometry

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

    Answer: 9.9cm
  4. 4. Ratio

    Share 85 in the ratio 3:2

    Answer: 51 and 34
  5. 5. Statistics

    Find the mean of: 7, 14, 5, 4

    Answer: 7.5

Wednesday 18 February 2026

Keystones #49 · Five questions · Open this day only

  1. 1. Number

    Calculate: 1⁄5 + 3⁄5

    Answer: 4⁄5
  2. 2. Algebra

    Solve: 6x - 18 = 6

    Answer: x = 4
  3. 3. Geometry

    Calculate the hypotenuse when a = 12cm and b = 14cm

    Answer: 18.44cm
  4. 4. Ratio

    Share 24 in the ratio 1:3

    Answer: 6 and 18
  5. 5. Statistics

    Find the mean of: 6, 9, 6, 7

    Answer: 7

Thursday 19 February 2026

Keystones #50 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄3 + 4⁄6

    Answer: 4⁄3
  2. 2. Algebra

    Solve: 5x + 7 = 57

    Answer: x = 10
  3. 3. Geometry

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

    Answer: 17cm
  4. 4. Ratio

    Share 95 in the ratio 2:3

    Answer: 38 and 57
  5. 5. Statistics

    Calculate the mean of: 33, 12, 6, 16, 26, 6, 44, 21

    Answer: 20.5

Friday 20 February 2026

Keystones #51 · Five questions · Open this day only

  1. 1. Number

    Calculate: 4⁄7 + 2⁄7

    Answer: 6⁄7
  2. 2. Algebra

    Solve: 2x + 9 = 15

    Answer: x = 3
  3. 3. Geometry

    Calculate the hypotenuse when a = 10cm and b = 7cm

    Answer: 12.21cm
  4. 4. Ratio

    Share 30 in the ratio 2:1

    Answer: 20 and 10
  5. 5. Statistics

    Find the mean of: 5, 3, 15

    Answer: 7.6666666666667