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Cornerstone Mar 5 - 11 25 questions
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Monday 9 March 2026

Keystones #68 · Five questions · Open this day only

  1. 1. Number

    Calculate: 64 + 66

    Answer: 64 + 66 = 130
  2. 2. Algebra

    Solve: x + 13 = 21

    Answer: x = 8
  3. 3. Geometry

    Find the area of a circle with radius 4cm

    Answer: 50.27cm²
  4. 4. Ratio

    Find 81% of 315

    Answer: 255.15
  5. 5. Statistics

    Calculate the mean of: 30, 47, 34, 30, 33, 5, 10, 5

    Answer: 24.3

Tuesday 10 March 2026

Keystones #69 · Five questions · Open this day only

  1. 1. Number

    Calculate: 8 × 11

    Answer: 8 × 11 = 88
  2. 2. Algebra

    Expand: 8(x + 7)

    Answer: 8x + 56
  3. 3. Geometry

    Calculate the perimeter of a right triangle with sides 9cm and 6cm

    Answer: 25.8cm
  4. 4. Ratio

    Find 58% of 225

    Answer: 130.5
  5. 5. Statistics

    Calculate the range of: 68, 94, 34, 89, 107, 86

    Answer: 73

Wednesday 11 March 2026

Keystones #70 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 50 + ? = 197

    Answer: 147
  2. 2. Algebra

    Solve: 4x = 16

    Answer: x = 4
  3. 3. Geometry

    Opposite = 6cm, hypotenuse = 12cm. Find the angle

    Answer: 30° (approximately)
  4. 4. Ratio

    Simplify: 12:12:10

    Answer: 6:6:5
  5. 5. Statistics

    What is the probability of getting heads when flipping a fair coin?

    Answer: 1⁄2

Thursday 12 March 2026

Keystones #71 · Five questions · Open this day only

  1. 1. Number

    Calculate: 63 + 96

    Answer: 63 + 96 = 159
  2. 2. Algebra

    Factorise: 8x² + 7x

    Answer: x(8x + 7)
  3. 3. Geometry

    Calculate perimeter: two sides are 15cm and 13cm at right angles

    Answer: 47.8cm
  4. 4. Ratio

    Find 73% of 361

    Answer: 263.53
  5. 5. Statistics

    Find the range of: 31, 19, 35, 12, 19

    Answer: 23

Friday 13 March 2026

Keystones #72 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 93 + ? = 125

    Answer: 32
  2. 2. Algebra

    Simplify: 5x + 5x

    Answer: 10x
  3. 3. Geometry

    Find the perimeter of a right triangle with sides 3cm and 4cm

    Answer: 12cm
  4. 4. Ratio

    Simplify: 12:8:8

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

    A bag has 6 red and 6 blue balls. What is the probability of picking a red ball?

    Answer: 1⁄2