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Cornerstone Dec 20 - 26 25 questions
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Monday 20 December 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 5⁄8 + 2⁄6

    Answer: 23⁄24
  2. 2. Algebra

    Solve: 2x - 20 = 6

    Answer: x = 13
  3. 3. Geometry

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

    Answer: 25cm
  4. 4. Ratio

    Share 140 in the ratio 3:4

    Answer: 60 and 80
  5. 5. Statistics

    Find the mean of: 13, 18, 8

    Answer: 13

Tuesday 21 December 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄11 + 1⁄11

    Answer: 3⁄11
  2. 2. Algebra

    Solve: 7x + 7 = 70

    Answer: x = 9
  3. 3. Geometry

    Calculate the hypotenuse when a = 5cm and b = 15cm

    Answer: 15.81cm
  4. 4. Ratio

    Share 84 in the ratio 1:2

    Answer: 28 and 56
  5. 5. Statistics

    Calculate the mean of: 26, 26, 28, 25, 22, 23, 27, 35

    Answer: 26.5

Wednesday 22 December 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 3⁄5 + 3⁄4

    Answer: 27⁄20
  2. 2. Algebra

    Solve: 4x + 6 = 38

    Answer: x = 8
  3. 3. Geometry

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

    Answer: 41cm
  4. 4. Ratio

    Share 120 in the ratio 2:1

    Answer: 80 and 40
  5. 5. Statistics

    Calculate the mean of: 14, 41, 49, 22, 20, 31, 9

    Answer: 26.6

Thursday 23 December 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 1⁄7 + 5⁄7

    Answer: 6⁄7
  2. 2. Algebra

    Solve: 7x - 10 = 81

    Answer: x = 13
  3. 3. Geometry

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

    Answer: 16.12cm
  4. 4. Ratio

    Share 85 in the ratio 2:3

    Answer: 34 and 51
  5. 5. Statistics

    Find the mean of: 18, 5, 5, 8

    Answer: 9

Friday 24 December 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 4⁄10 + 5⁄10

    Answer: 9⁄10
  2. 2. Algebra

    Solve: 3x - 6 = 18

    Answer: x = 8
  3. 3. Geometry

    Calculate the hypotenuse when a = 6cm and b = 10cm

    Answer: 11.66cm
  4. 4. Ratio

    Divide 234 in the ratio 3:4:2

    Answer: 78, 104 and 52
  5. 5. Statistics

    Calculate the mean of: 13, 7, 17, 38, 38, 44

    Answer: 26.2