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Cornerstone Aug 6 - 12 25 questions
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Monday 10 August 2026

Keystones #56 · Five questions · Open this day only

  1. 1. Number

    Calculate: 50 + 43

    Answer: 50 + 43 = 93
  2. 2. Algebra

    Solve: 9x = 99

    Answer: x = 11
  3. 3. Geometry

    Opposite = 13cm, hypotenuse = 15cm. Find the angle

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

    Calculate 10% of 58

    Answer: 5.8
  5. 5. Statistics

    Find the mean of: 16, 12, 16

    Answer: 14.666666666667

Tuesday 11 August 2026

Keystones #57 · Five questions · Open this day only

  1. 1. Number

    Add: 7⁄8 + 1⁄6

    Answer: 25⁄24
  2. 2. Algebra

    Solve: x + 2 = 7

    Answer: x = 5
  3. 3. Geometry

    Opposite = 12cm, adjacent = 17cm. Calculate the angle

    Answer: 35.2°
  4. 4. Ratio

    Simplify the ratio 6:16

    Answer: 3:8
  5. 5. Statistics

    Calculate the mean of: 34, 36, 44, 12, 41, 41

    Answer: 34.7

Wednesday 12 August 2026

Keystones #58 · Five questions · Open this day only

  1. 1. Number

    Calculate: 39 + 43

    Answer: 39 + 43 = 82
  2. 2. Algebra

    Solve: x + 8 = 14

    Answer: x = 6
  3. 3. Geometry

    Opposite = 12cm, hypotenuse = 13.9cm. Find the angle

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

    Simplify the ratio 9:12

    Answer: 3:4
  5. 5. Statistics

    A bag has 8 red and 8 blue balls. What is the probability of picking a red ball?

    Answer: 1⁄2

Thursday 13 August 2026

Keystones #59 · Five questions · Open this day only

  1. 1. Number

    Calculate: 618 + 708

    Answer: 618 + 708 = 1326
  2. 2. Algebra

    Solve: 4x = 52

    Answer: x = 13
  3. 3. Geometry

    Opposite = 12cm, adjacent = 11cm. Calculate the angle

    Answer: 47.5°
  4. 4. Ratio

    Calculate 50% of 109

    Answer: 54.5
  5. 5. Statistics

    Find the mean of: 18, 6, 18

    Answer: 14

Friday 14 August 2026

Keystones #60 · Five questions · Open this day only

  1. 1. Number

    Add: 42.48 + 53.68

    Answer: 42.48 + 53.68 = 96.16
  2. 2. Algebra

    What is the next term? 5, 10, 20, 40, ...

    Answer: 80
  3. 3. Geometry

    Calculate the hypotenuse when a = 10cm and b = 9cm

    Answer: 13.45cm
  4. 4. Ratio

    Simplify: 18:15:12

    Answer: 6:5:4
  5. 5. Statistics

    Calculate the mean of: 44, 42, 30, 19, 46, 37, 41

    Answer: 37