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Cornerstone Dec 15 - 21 25 questions
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Monday 15 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 4⁄12 + 2⁄12

    Answer: 1⁄2
  2. 2. Algebra

    Solve: 5x + 8 = 53

    Answer: x = 9
  3. 3. Geometry

    Calculate the hypotenuse when a = 3cm and b = 14cm

    Answer: 14.32cm
  4. 4. Ratio

    Divide 176 in the ratio 1:4:3

    Answer: 22, 88 and 66
  5. 5. Statistics

    Find the mean of: 6, 2, 6

    Answer: 4.6666666666667

Tuesday 16 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄6 + 1⁄8

    Answer: 11⁄24
  2. 2. Algebra

    Solve: 2x + 9 = 23

    Answer: x = 7
  3. 3. Geometry

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

    Answer: 29cm
  4. 4. Ratio

    Divide 184 in the ratio 1:2:1

    Answer: 46, 92 and 46
  5. 5. Statistics

    Find the mean of: 5, 6, 18, 11

    Answer: 10

Wednesday 17 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 10⁄12 + 1⁄12

    Answer: 11⁄12
  2. 2. Algebra

    Solve: 8x - 5 = 115

    Answer: x = 15
  3. 3. Geometry

    Calculate the hypotenuse when a = 11cm and b = 9cm

    Answer: 14.21cm
  4. 4. Ratio

    Divide 187 in the ratio 4:3:4

    Answer: 68, 51 and 68
  5. 5. Statistics

    Calculate the mean of: 35, 8, 19, 38, 34, 39, 23

    Answer: 28

Thursday 18 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄6 + 2⁄6

    Answer: 2⁄3
  2. 2. Algebra

    Solve: 7x - 6 = 71

    Answer: x = 11
  3. 3. Geometry

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

    Answer: 6.4cm
  4. 4. Ratio

    Divide 132 in the ratio 2:1:3

    Answer: 44, 22 and 66
  5. 5. Statistics

    Calculate the mean of: 16, 26, 15, 22, 26, 16

    Answer: 20.2

Friday 19 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄4 + 4⁄7

    Answer: 15⁄14
  2. 2. Algebra

    Solve: 7x + 10 = 66

    Answer: x = 8
  3. 3. Geometry

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

    Answer: 25cm
  4. 4. Ratio

    Divide 95 in the ratio 1:1:3

    Answer: 19, 19 and 57
  5. 5. Statistics

    Find the mean of: 6, 19, 4

    Answer: 9.6666666666667