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Cornerstone Sep 13 - 19 25 questions
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Monday 13 September 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 4⁄7 + 2⁄3

    Answer: 26⁄21
  2. 2. Algebra

    Solve: 2x - 10 = 8

    Answer: x = 9
  3. 3. Geometry

    Calculate the hypotenuse when a = 10cm and b = 10cm

    Answer: 14.14cm
  4. 4. Ratio

    Share 60 in the ratio 2:1

    Answer: 40 and 20
  5. 5. Statistics

    Find the mean of: 17, 12, 16, 10

    Answer: 13.75

Tuesday 14 September 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 6⁄7 + 3⁄4

    Answer: 45⁄28
  2. 2. Algebra

    Solve: 7x - 20 = 78

    Answer: x = 14
  3. 3. Geometry

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

    Answer: 5.66cm
  4. 4. Ratio

    Divide 232 in the ratio 2:3:3

    Answer: 58, 87 and 87
  5. 5. Statistics

    Calculate the mean of: 23, 25, 15, 50, 37, 13, 42, 46

    Answer: 31.4

Wednesday 15 September 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 1⁄7 + 1⁄7

    Answer: 2⁄7
  2. 2. Algebra

    Solve: 3x + 3 = 39

    Answer: x = 12
  3. 3. Geometry

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

    Answer: 29cm
  4. 4. Ratio

    Divide 189 in the ratio 4:3:2

    Answer: 84, 63 and 42
  5. 5. Statistics

    Find the mean of: 20, 16, 2, 16

    Answer: 13.5

Thursday 16 September 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 1⁄8 + 1⁄5

    Answer: 13⁄40
  2. 2. Algebra

    Solve: 3x + 4 = 22

    Answer: x = 6
  3. 3. Geometry

    Calculate the hypotenuse when a = 5cm and b = 13cm

    Answer: 13.93cm
  4. 4. Ratio

    Divide 300 in the ratio 2:1:2

    Answer: 120, 60 and 120
  5. 5. Statistics

    Find the mean of: 15, 16, 18

    Answer: 16.333333333333

Friday 17 September 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 3⁄12 + 3⁄12

    Answer: 1⁄2
  2. 2. Algebra

    Solve: 5x - 6 = 14

    Answer: x = 4
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 12cm and 35cm

    Answer: 37cm
  4. 4. Ratio

    Divide 133 in the ratio 3:1:3

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

    Calculate the mean of: 41, 46, 20, 36, 8, 24, 49, 44

    Answer: 33.5