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Cornerstone Feb 10 - 16 25 questions
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Monday 10 February 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 6⁄7 + 5⁄6

    Answer: 71⁄42
  2. 2. Algebra

    Solve: 5x - 10 = 40

    Answer: x = 10
  3. 3. Geometry

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

    Answer: 25cm
  4. 4. Ratio

    Share 84 in the ratio 2:1

    Answer: 56 and 28
  5. 5. Statistics

    Find the mean of: 11, 4, 18

    Answer: 11

Tuesday 11 February 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 8⁄10 + 1⁄10

    Answer: 9⁄10
  2. 2. Algebra

    Solve: 3x + 15 = 39

    Answer: x = 8
  3. 3. Geometry

    Calculate the hypotenuse when a = 3cm and b = 6cm

    Answer: 6.71cm
  4. 4. Ratio

    Share 24 in the ratio 3:1

    Answer: 18 and 6
  5. 5. Statistics

    Calculate the mean of: 44, 26, 14, 36, 33, 35, 42, 23

    Answer: 31.6

Wednesday 12 February 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 3⁄4 + 6⁄7

    Answer: 45⁄28
  2. 2. Algebra

    Solve: 7x + 10 = 52

    Answer: x = 6
  3. 3. Geometry

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

    Answer: 5cm
  4. 4. Ratio

    Share 56 in the ratio 4:3

    Answer: 32 and 24
  5. 5. Statistics

    Calculate the mean of: 36, 27, 12, 36, 19, 10, 33

    Answer: 24.7

Thursday 13 February 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 1⁄8 + 5⁄8

    Answer: 3⁄4
  2. 2. Algebra

    Solve: 2x - 5 = 9

    Answer: x = 7
  3. 3. Geometry

    Calculate the hypotenuse when a = 6cm and b = 13cm

    Answer: 14.32cm
  4. 4. Ratio

    Share 77 in the ratio 3:4

    Answer: 33 and 44
  5. 5. Statistics

    Find the mean of: 12, 14, 9

    Answer: 11.666666666667

Friday 14 February 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄9 + 2⁄9

    Answer: 4⁄9
  2. 2. Algebra

    Solve: 3x - 13 = 17

    Answer: x = 10
  3. 3. Geometry

    Calculate the hypotenuse when a = 4cm and b = 13cm

    Answer: 13.6cm
  4. 4. Ratio

    Divide 120 in the ratio 3:3:2

    Answer: 45, 45 and 30
  5. 5. Statistics

    Calculate the mean of: 16, 38, 32, 45, 48, 25, 26

    Answer: 32.9