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Cornerstone Dec 29 - Jan 4 25 questions
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Monday 29 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 3⁄4 + 2⁄5

    Answer: 23⁄20
  2. 2. Algebra

    Solve: 6x - 14 = 34

    Answer: x = 8
  3. 3. Geometry

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

    Answer: 29cm
  4. 4. Ratio

    Share 75 in the ratio 2:3

    Answer: 30 and 45
  5. 5. Statistics

    Calculate the mean of: 26, 32, 15, 43, 35, 23

    Answer: 29

Tuesday 30 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄8 + 1⁄5

    Answer: 9⁄20
  2. 2. Algebra

    Solve: 4x - 20 = 20

    Answer: x = 10
  3. 3. Geometry

    Calculate the hypotenuse when a = 4cm and b = 11cm

    Answer: 11.7cm
  4. 4. Ratio

    Share 40 in the ratio 2:3

    Answer: 16 and 24
  5. 5. Statistics

    Calculate the mean of: 27, 35, 29, 37, 48, 25

    Answer: 33.5

Wednesday 31 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: 7x + 8 = 85

    Answer: x = 11
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 15cm and 20cm

    Answer: 25cm
  4. 4. Ratio

    Share 35 in the ratio 4:1

    Answer: 28 and 7
  5. 5. Statistics

    Find the mean of: 2, 4, 18

    Answer: 8

Thursday 1 January 2026

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 1⁄12 + 10⁄12

    Answer: 11⁄12
  2. 2. Algebra

    Solve: 4x - 16 = 12

    Answer: x = 7
  3. 3. Geometry

    Calculate the hypotenuse when a = 11cm and b = 7cm

    Answer: 13.04cm
  4. 4. Ratio

    Divide 132 in the ratio 3:4:4

    Answer: 36, 48 and 48
  5. 5. Statistics

    Find the mean of: 19, 11, 10, 17

    Answer: 14.25

Friday 2 January 2026

Keystones #2 · Five questions · Open this day only

  1. 1. Number

    Add: 6⁄8 + 3⁄4

    Answer: 3⁄2
  2. 2. Algebra

    Solve: 6x - 13 = 29

    Answer: x = 7
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 15cm and 36cm

    Answer: 39cm
  4. 4. Ratio

    Divide 160 in the ratio 4:3:1

    Answer: 80, 60 and 20
  5. 5. Statistics

    Find the mean of: 8, 18, 9, 16, 14

    Answer: 13