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Cornerstone Jan 3 - 9 25 questions
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Monday 3 January 2022

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 6⁄8 + 5⁄7

    Answer: 41⁄28
  2. 2. Algebra

    Solve: 3x - 18 = 0

    Answer: x = 6
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 12cm and 16cm

    Answer: 20cm
  4. 4. Ratio

    Share 84 in the ratio 4:3

    Answer: 48 and 36
  5. 5. Statistics

    Find the mean of: 14, 8, 5

    Answer: 9

Tuesday 4 January 2022

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 5⁄7 + 4⁄8

    Answer: 17⁄14
  2. 2. Algebra

    Solve: 6x - 14 = 52

    Answer: x = 11
  3. 3. Geometry

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

    Answer: 29cm
  4. 4. Ratio

    Divide 100 in the ratio 2:1:2

    Answer: 40, 20 and 40
  5. 5. Statistics

    Calculate the mean of: 24, 9, 11, 49, 28, 29, 46

    Answer: 28

Wednesday 5 January 2022

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 5⁄7 + 1⁄7

    Answer: 6⁄7
  2. 2. Algebra

    Solve: 7x + 12 = 40

    Answer: x = 4
  3. 3. Geometry

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

    Answer: 16.97cm
  4. 4. Ratio

    Divide 190 in the ratio 3:4:3

    Answer: 57, 76 and 57
  5. 5. Statistics

    Find the mean of: 15, 4, 3

    Answer: 7.3333333333333

Thursday 6 January 2022

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 7⁄8 + 3⁄6

    Answer: 11⁄8
  2. 2. Algebra

    Solve: 7x + 7 = 77

    Answer: x = 10
  3. 3. Geometry

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

    Answer: 25cm
  4. 4. Ratio

    Divide 319 in the ratio 4:3:4

    Answer: 116, 87 and 116
  5. 5. Statistics

    Find the mean of: 3, 11, 2, 3, 17

    Answer: 7.2

Friday 7 January 2022

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄8 + 1⁄8

    Answer: 3⁄8
  2. 2. Algebra

    Solve: 2x - 10 = 18

    Answer: x = 14
  3. 3. Geometry

    Calculate the hypotenuse when a = 9cm and b = 11cm

    Answer: 14.21cm
  4. 4. Ratio

    Divide 95 in the ratio 1:1:3

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

    Calculate the mean of: 23, 5, 19, 44, 36, 17

    Answer: 24