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Cornerstone Apr 23 - 29 25 questions
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Monday 27 April 2026

Keystones #117 · Five questions · Open this day only

  1. 1. Number

    Calculate: 884 + 634

    Answer: 884 + 634 = 1518
  2. 2. Algebra

    Solve: x + 13 = 23

    Answer: x = 10
  3. 3. Geometry

    Opposite = 14cm, adjacent = 19cm. Calculate the angle

    Answer: 36.4°
  4. 4. Ratio

    Find 60% of 98

    Answer: 58.8
  5. 5. Statistics

    What is the probability of rolling a 2 on a fair die?

    Answer: 1⁄6

Tuesday 28 April 2026

Keystones #118 · Five questions · Open this day only

  1. 1. Number

    Add: 1⁄4 + 4⁄5

    Answer: 21⁄20
  2. 2. Algebra

    Simplify: 3x + 5x

    Answer: 8x
  3. 3. Geometry

    Opposite = 19cm, adjacent = 10cm. Calculate the angle

    Answer: 62.2°
  4. 4. Ratio

    Find 32% of 331

    Answer: 105.92
  5. 5. Statistics

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

    Answer: 10.6

Wednesday 29 April 2026

Keystones #119 · Five questions · Open this day only

  1. 1. Number

    Calculate: 71 + 74

    Answer: 71 + 74 = 145
  2. 2. Algebra

    Expand: 6(2x + 5)

    Answer: 12x + 30
  3. 3. Geometry

    Find the area of a circle with radius 10cm

    Answer: 314.16cm²
  4. 4. Ratio

    Simplify: 8:12:12

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

    Calculate the mean of: 14, 12, 45, 19, 49, 42, 21

    Answer: 28.9

Thursday 30 April 2026

Keystones #120 · Five questions · Open this day only

  1. 1. Number

    Calculate: 74 + 58

    Answer: 74 + 58 = 132
  2. 2. Algebra

    Factorise: 2x² + 3x

    Answer: x(2x + 3)
  3. 3. Geometry

    Opposite = 18cm, adjacent = 8cm. Calculate the angle

    Answer: 66°
  4. 4. Ratio

    Find 36% of 180

    Answer: 64.8
  5. 5. Statistics

    Calculate the mean of: 38, 48, 37, 50, 8, 50, 22

    Answer: 36.1

Friday 1 May 2026

Keystones #121 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 47 + ? = 106

    Answer: 59
  2. 2. Algebra

    Solve: x + 8 = 18

    Answer: x = 10
  3. 3. Geometry

    Find the area of a circle with radius 9cm

    Answer: 254.47cm²
  4. 4. Ratio

    Simplify: 10:12:12

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

    A bag has 7 red and 7 blue balls. What is the probability of picking a red ball?

    Answer: 1⁄2