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Cornerstone Jun 25 - Jul 1 25 questions
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Monday 29 June 2026

Keystones #14 · Five questions · Open this day only

  1. 1. Number

    Calculate: 66 + 69

    Answer: 66 + 69 = 135
  2. 2. Algebra

    Factorise: 40x + 20

    Answer: 5(8x + 4)
  3. 3. Geometry

    Calculate the area of a circle with diameter 8cm

    Answer: 50.27cm²
  4. 4. Ratio

    Find 54% of 437

    Answer: 235.98
  5. 5. Statistics

    Calculate the range of: 61, 72, 37, 43, 41, 68

    Answer: 35

Tuesday 30 June 2026

Keystones #15 · Five questions · Open this day only

  1. 1. Number

    Calculate: 86 + 36

    Answer: 86 + 36 = 122
  2. 2. Algebra

    For y = x³, find y when x = 3

    Answer: y = 27
  3. 3. Geometry

    Find the area of a circle with radius 9cm

    Answer: 254.47cm²
  4. 4. Ratio

    Find 57% of 472

    Answer: 269.04
  5. 5. Statistics

    Calculate the mean of: 41, 26, 46, 15, 7, 9

    Answer: 24

Wednesday 1 July 2026

Keystones #16 · Five questions · Open this day only

  1. 1. Number

    Calculate: 180 + 714

    Answer: 180 + 714 = 894
  2. 2. Algebra

    Solve: 3x = 15

    Answer: x = 5
  3. 3. Geometry

    Calculate the area of a circle with diameter 17cm

    Answer: 226.98cm²
  4. 4. Ratio

    Find 15% of 346

    Answer: 51.9
  5. 5. Statistics

    Calculate the mean of: 47, 39, 10, 27, 49, 48, 16

    Answer: 33.7

Thursday 2 July 2026

Keystones #17 · Five questions · Open this day only

  1. 1. Number

    Calculate: 23 + 55

    Answer: 23 + 55 = 78
  2. 2. Algebra

    For y = x³ + 5, calculate y when x = 3

    Answer: y = 32
  3. 3. Geometry

    Find the distance between (3, 4) and (8, 10)

    Answer: 7.81
  4. 4. Ratio

    Find 37% of 291

    Answer: 107.67
  5. 5. Statistics

    Calculate the mean of: 30, 50, 15, 27, 25, 17, 39, 13

    Answer: 27

Friday 3 July 2026

Keystones #18 · Five questions · Open this day only

  1. 1. Number

    Find the total of 158, 141, and 136

    Answer: 435
  2. 2. Algebra

    Find the next term: 25, 34, 43, 52, ...

    Answer: 61
  3. 3. Geometry

    Opposite = 13cm, adjacent = 18cm. Calculate the angle

    Answer: 35.8°
  4. 4. Ratio

    Simplify: 18:15:18

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

    What is the probability of rolling a 3 on a fair die?

    Answer: 1⁄6