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Cornerstone Apr 7 - 13 25 questions
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Monday 7 April 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 1⁄3 + 4⁄5

    Answer: 17⁄15
  2. 2. Algebra

    Solve: 7x + 9 = 93

    Answer: x = 12
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 8cm and 15cm

    Answer: 17cm
  4. 4. Ratio

    Divide 110 in the ratio 1:2:2

    Answer: 22, 44 and 44
  5. 5. Statistics

    Find the mean of: 14, 11, 16

    Answer: 13.666666666667

Tuesday 8 April 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄3 + 1⁄7

    Answer: 17⁄21
  2. 2. Algebra

    Solve: 7x + 5 = 26

    Answer: x = 3
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 9cm and 12cm

    Answer: 15cm
  4. 4. Ratio

    Divide 280 in the ratio 1:2:2

    Answer: 56, 112 and 112
  5. 5. Statistics

    Find the mean of: 17, 7, 14

    Answer: 12.666666666667

Wednesday 9 April 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 1⁄6 + 1⁄6

    Answer: 1⁄3
  2. 2. Algebra

    Solve: 2x - 20 = -12

    Answer: x = 4
  3. 3. Geometry

    Calculate the hypotenuse when a = 6cm and b = 15cm

    Answer: 16.16cm
  4. 4. Ratio

    Divide 126 in the ratio 2:4:3

    Answer: 28, 56 and 42
  5. 5. Statistics

    Calculate the mean of: 19, 30, 48, 7, 21, 30

    Answer: 25.8

Thursday 10 April 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 8⁄11 + 2⁄11

    Answer: 10⁄11
  2. 2. Algebra

    Solve: 7x - 19 = 51

    Answer: x = 10
  3. 3. Geometry

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

    Answer: 29cm
  4. 4. Ratio

    Divide 250 in the ratio 4:3:3

    Answer: 100, 75 and 75
  5. 5. Statistics

    Calculate the mean of: 25, 35, 5, 30, 20, 6, 14

    Answer: 19.3

Friday 11 April 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄5 + 1⁄3

    Answer: 11⁄15
  2. 2. Algebra

    Solve: 4x + 9 = 25

    Answer: x = 4
  3. 3. Geometry

    Calculate the hypotenuse when a = 8cm and b = 15cm

    Answer: 17cm
  4. 4. Ratio

    Divide 70 in the ratio 2:4:1

    Answer: 20, 40 and 10
  5. 5. Statistics

    Find the mean of: 6, 6, 5

    Answer: 5.6666666666667