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Cornerstone Sep 15 - 21 25 questions
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Monday 15 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 3⁄6 + 4⁄8

    Answer: 1⁄1
  2. 2. Algebra

    Solve: 7x - 14 = 70

    Answer: x = 12
  3. 3. Geometry

    Calculate the hypotenuse when a = 8cm and b = 14cm

    Answer: 16.12cm
  4. 4. Ratio

    Share 52 in the ratio 1:3

    Answer: 13 and 39
  5. 5. Statistics

    Calculate the mean of: 16, 32, 39, 10, 45, 25, 19, 38

    Answer: 28

Tuesday 16 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 4⁄12 + 7⁄12

    Answer: 11⁄12
  2. 2. Algebra

    Solve: 3x - 13 = 11

    Answer: x = 8
  3. 3. Geometry

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

    Answer: 10cm
  4. 4. Ratio

    Share 57 in the ratio 1:2

    Answer: 19 and 38
  5. 5. Statistics

    Calculate the mean of: 24, 11, 17, 11, 14, 19

    Answer: 16

Wednesday 17 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 1⁄3 + 2⁄4

    Answer: 5⁄6
  2. 2. Algebra

    Solve: 6x + 5 = 77

    Answer: x = 12
  3. 3. Geometry

    Calculate the hypotenuse when a = 3cm and b = 11cm

    Answer: 11.4cm
  4. 4. Ratio

    Share 18 in the ratio 2:1

    Answer: 12 and 6
  5. 5. Statistics

    Find the mean of: 14, 20, 20, 9, 10

    Answer: 14.6

Thursday 18 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 4⁄6 + 2⁄8

    Answer: 11⁄12
  2. 2. Algebra

    Solve: 4x + 6 = 54

    Answer: x = 12
  3. 3. Geometry

    Calculate the hypotenuse when a = 12cm and b = 15cm

    Answer: 19.21cm
  4. 4. Ratio

    Share 75 in the ratio 4:1

    Answer: 60 and 15
  5. 5. Statistics

    Find the mean of: 17, 16, 14, 13

    Answer: 15

Friday 19 September 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄9 + 1⁄9

    Answer: 1⁄3
  2. 2. Algebra

    Solve: 5x - 13 = 12

    Answer: x = 5
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 9cm and 12cm

    Answer: 15cm
  4. 4. Ratio

    Share 45 in the ratio 2:3

    Answer: 18 and 27
  5. 5. Statistics

    Calculate the mean of: 30, 40, 49, 24, 36, 12, 14, 26

    Answer: 28.9