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Cornerstone Jul 27 - Aug 2 25 questions
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Monday 27 July 2026

Keystones #208 · Five questions · Open this day only

  1. 1. Number

    Calculate: 3⁄5 × 7

    Answer: 21⁄5
  2. 2. Algebra

    Expand: 9(x + 8)

    Answer: 9x + 72
  3. 3. Geometry

    In a right triangle, if c = 13cm and a = 5cm, find b

    Answer: 12cm
  4. 4. Ratio

    In ratio 3:1, the difference between shares is 42. What are the shares?

    Answer: 63 and 21
  5. 5. Statistics

    Find the range of: 28, 25, 18, 25, 23

    Answer: 10

Tuesday 28 July 2026

Keystones #209 · Five questions · Open this day only

  1. 1. Number

    Calculate: 5⁄9 × 4

    Answer: 20⁄9
  2. 2. Algebra

    Expand: 5(x + 7)

    Answer: 5x + 35
  3. 3. Geometry

    In a right triangle, if c = 10cm and a = 6cm, find b

    Answer: 8cm
  4. 4. Ratio

    In ratio 3:1, the difference between shares is 56. What are the shares?

    Answer: 84 and 28
  5. 5. Statistics

    Find the range of: 23, 31, 16, 10, 24

    Answer: 21

Wednesday 29 July 2026

Keystones #210 · Five questions · Open this day only

  1. 1. Number

    Multiply: 3⁄7 × 5⁄7

    Answer: 15⁄49
  2. 2. Algebra

    Expand: 2(2x + 6)

    Answer: 4x + 12
  3. 3. Geometry

    Find b if a = 9cm and c = 13cm

    Answer: 9.38cm
  4. 4. Ratio

    In ratio 4:3, the difference between shares is 26. What are the shares?

    Answer: 104 and 78
  5. 5. Statistics

    Calculate the range of: 121, 98, 114, 90, 46, 74

    Answer: 75

Thursday 30 July 2026

Keystones #211 · Five questions · Open this day only

  1. 1. Number

    Multiply: 5⁄5 × 5⁄8

    Answer: 5⁄8
  2. 2. Algebra

    Expand: 3(6x + 4)

    Answer: 18x + 12
  3. 3. Geometry

    In a right triangle, if c = 5cm and a = 3cm, find b

    Answer: 4cm
  4. 4. Ratio

    In ratio 4:1, the difference between shares is 75. What are the shares?

    Answer: 100 and 25
  5. 5. Statistics

    Calculate the range of: 26, 38, 76, 28, 63, 79

    Answer: 53

Friday 31 July 2026

Keystones #212 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄5 × 3

    Answer: 6⁄5
  2. 2. Algebra

    Expand: 3(x + 6)

    Answer: 3x + 18
  3. 3. Geometry

    Find b if a = 6cm and c = 13cm

    Answer: 11.53cm
  4. 4. Ratio

    In ratio 5:2, the difference between shares is 63. What are the shares?

    Answer: 105 and 42
  5. 5. Statistics

    Find the range of: 23, 35, 6, 30, 27

    Answer: 29