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Cornerstone Apr 16 - 22 25 questions
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Monday 13 April 2026

Keystones #103 · Five questions · Open this day only

  1. 1. Number

    Calculate: 83 + 91

    Answer: 83 + 91 = 174
  2. 2. Algebra

    Expand: 6(3x + 9)

    Answer: 18x + 54
  3. 3. Geometry

    Opposite = 7cm, hypotenuse = 8.cm. Find the angle

    Answer: 60° (approximately)
  4. 4. Ratio

    Simplify: 9:6:15

    Answer: 3:2:5
  5. 5. Statistics

    Find the mean of: 20, 9, 4, 3, 14

    Answer: 10

Tuesday 14 April 2026

Keystones #104 · Five questions · Open this day only

  1. 1. Number

    Calculate: 80 + 93

    Answer: 80 + 93 = 173
  2. 2. Algebra

    Solve: 9x = 117

    Answer: x = 13
  3. 3. Geometry

    Find the distance between (4, 5) and (7, 13)

    Answer: 8.54
  4. 4. Ratio

    Simplify the ratio 24:20

    Answer: 6:5
  5. 5. Statistics

    Calculate the mean of: 19, 36, 46, 9, 47, 49, 37, 41

    Answer: 35.5

Wednesday 15 April 2026

Keystones #105 · Five questions · Open this day only

  1. 1. Number

    330000

    Answer: 3.3 × 105
  2. 2. Algebra

    Solve: x + 12 = 25

    Answer: x = 13
  3. 3. Geometry

    Calculate the area of a circle with diameter 22cm

    Answer: 380.13cm²
  4. 4. Ratio

    Calculate 50% of 41

    Answer: 20.5
  5. 5. Statistics

    Find the mean of: 2, 14, 7, 12

    Answer: 8.75

Thursday 16 April 2026

Keystones #106 · Five questions · Open this day only

  1. 1. Number

    Calculate: 22 + 33

    Answer: 22 + 33 = 55
  2. 2. Algebra

    Solve: x + 3 = 14

    Answer: x = 11
  3. 3. Geometry

    Opposite = 8cm, hypotenuse = 9.2cm. Find the angle

    Answer: 60° (approximately)
  4. 4. Ratio

    Simplify the ratio 15:40

    Answer: 3:8
  5. 5. Statistics

    Find the mean of: 2, 14, 18, 7, 8

    Answer: 9.8

Friday 17 April 2026

Keystones #107 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 46 + ? = 130

    Answer: 84
  2. 2. Algebra

    Expand: 2(3x + 7)

    Answer: 6x + 14
  3. 3. Geometry

    Calculate the hypotenuse when a = 8cm and b = 4cm

    Answer: 8.94cm
  4. 4. Ratio

    Simplify the ratio 35:30

    Answer: 7:6
  5. 5. Statistics

    Calculate the range of: 65, 43, 100, 113, 48, 114

    Answer: 71