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Cornerstone Dec 21 - 27 25 questions
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Monday 21 December 2020

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 5⁄6 + 3⁄7

    Answer: 53⁄42
  2. 2. Algebra

    Solve: 7x + 8 = 78

    Answer: x = 10
  3. 3. Geometry

    Calculate the hypotenuse when a = 3cm and b = 8cm

    Answer: 8.54cm
  4. 4. Ratio

    Share 36 in the ratio 1:3

    Answer: 9 and 27
  5. 5. Statistics

    Calculate the mean of: 17, 9, 14, 43, 35, 6, 17, 35

    Answer: 22

Tuesday 22 December 2020

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 3⁄7 + 1⁄7

    Answer: 4⁄7
  2. 2. Algebra

    Solve: 7x + 11 = 32

    Answer: x = 3
  3. 3. Geometry

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

    Answer: 10cm
  4. 4. Ratio

    Share 65 in the ratio 3:2

    Answer: 39 and 26
  5. 5. Statistics

    Calculate the mean of: 18, 10, 42, 7, 24, 16, 13

    Answer: 18.6

Wednesday 23 December 2020

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄6 + 3⁄8

    Answer: 17⁄24
  2. 2. Algebra

    Solve: 8x - 6 = 114

    Answer: x = 15
  3. 3. Geometry

    Calculate the hypotenuse when a = 7cm and b = 12cm

    Answer: 13.89cm
  4. 4. Ratio

    Share 25 in the ratio 3:2

    Answer: 15 and 10
  5. 5. Statistics

    Find the mean of: 10, 2, 20, 15

    Answer: 11.75

Thursday 24 December 2020

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 4⁄8 + 2⁄3

    Answer: 7⁄6
  2. 2. Algebra

    Solve: 8x - 13 = 67

    Answer: x = 10
  3. 3. Geometry

    Calculate the hypotenuse when a = 9cm and b = 12cm

    Answer: 15cm
  4. 4. Ratio

    Divide 112 in the ratio 1:1:2

    Answer: 28, 28 and 56
  5. 5. Statistics

    Calculate the mean of: 30, 7, 27, 13, 18, 40, 16, 48

    Answer: 24.9

Friday 25 December 2020

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 5⁄9 + 3⁄9

    Answer: 8⁄9
  2. 2. Algebra

    Solve: 2x + 6 = 28

    Answer: x = 11
  3. 3. Geometry

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

    Answer: 41cm
  4. 4. Ratio

    Divide 112 in the ratio 3:2:3

    Answer: 42, 28 and 42
  5. 5. Statistics

    Find the mean of: 18, 8, 7, 19, 4

    Answer: 11.2