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Cornerstone Jan 20 - 26 25 questions
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Monday 20 January 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 1⁄3 + 3⁄4

    Answer: 13⁄12
  2. 2. Algebra

    Solve: 5x + 8 = 63

    Answer: x = 11
  3. 3. Geometry

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

    Answer: 14.32cm
  4. 4. Ratio

    Share 30 in the ratio 4:1

    Answer: 24 and 6
  5. 5. Statistics

    Calculate the mean of: 32, 22, 50, 27, 45, 13, 30, 37

    Answer: 32

Tuesday 21 January 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄5 + 1⁄5

    Answer: 3⁄5
  2. 2. Algebra

    Solve: 2x - 12 = -2

    Answer: x = 5
  3. 3. Geometry

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

    Answer: 39cm
  4. 4. Ratio

    Share 102 in the ratio 1:2

    Answer: 34 and 68
  5. 5. Statistics

    Find the mean of: 7, 18, 20, 6

    Answer: 12.75

Wednesday 22 January 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 3⁄5 + 1⁄3

    Answer: 14⁄15
  2. 2. Algebra

    Solve: 6x - 13 = 11

    Answer: x = 4
  3. 3. Geometry

    Calculate the hypotenuse when a = 6cm and b = 4cm

    Answer: 7.21cm
  4. 4. Ratio

    Share 133 in the ratio 4:3

    Answer: 76 and 57
  5. 5. Statistics

    Find the mean of: 9, 14, 16, 10

    Answer: 12.25

Thursday 23 January 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 8⁄10 + 1⁄10

    Answer: 9⁄10
  2. 2. Algebra

    Solve: 6x + 11 = 53

    Answer: x = 7
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 9cm and 40cm

    Answer: 41cm
  4. 4. Ratio

    Share 90 in the ratio 1:2

    Answer: 30 and 60
  5. 5. Statistics

    Calculate the mean of: 29, 37, 5, 40, 10, 38

    Answer: 26.5

Friday 24 January 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 7⁄12 + 3⁄12

    Answer: 5⁄6
  2. 2. Algebra

    Solve: 3x + 13 = 49

    Answer: x = 12
  3. 3. Geometry

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

    Answer: 5cm
  4. 4. Ratio

    Divide 126 in the ratio 3:1:2

    Answer: 63, 21 and 42
  5. 5. Statistics

    Find the mean of: 4, 7, 4

    Answer: 5