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Cornerstone May 21 - 27 25 questions
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Monday 18 May 2026

Keystones #138 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 64 + ? = 160

    Answer: 96
  2. 2. Algebra

    Solve: x + 3 = 17

    Answer: x = 14
  3. 3. Geometry

    Opposite = 19cm, adjacent = 9cm. Calculate the angle

    Answer: 64.7°
  4. 4. Ratio

    Find 17% of 457

    Answer: 77.69
  5. 5. Statistics

    A bag has 8 red and 3 blue balls. What is the probability of picking a red ball?

    Answer: 8⁄11

Tuesday 19 May 2026

Keystones #139 · Five questions · Open this day only

  1. 1. Number

    Simplify: 84 × 84

    Answer: 88
  2. 2. Algebra

    Solve: 7x = 35

    Answer: x = 5
  3. 3. Geometry

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

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

    Find 73% of 293

    Answer: 213.89
  5. 5. Statistics

    Find the range of: 24, 19, 20, 44, 27

    Answer: 25

Wednesday 20 May 2026

Keystones #140 · Five questions · Open this day only

  1. 1. Number

    Calculate: 514 + 983

    Answer: 514 + 983 = 1497
  2. 2. Algebra

    Collect like terms: 4x + 5y + 2x + 6y

    Answer: 6x + 11y
  3. 3. Geometry

    Opposite = 16cm, adjacent = 9cm. Calculate the angle

    Answer: 60.6°
  4. 4. Ratio

    Simplify: 10:4:6

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

    Calculate the mean of: 6, 24, 32, 45, 14, 46, 41, 17

    Answer: 28.1

Thursday 21 May 2026

Keystones #141 · Five questions · Open this day only

  1. 1. Number

    Calculate: 62 + 24

    Answer: 62 + 24 = 86
  2. 2. Algebra

    Expand: 5(x + 9)

    Answer: 5x + 45
  3. 3. Geometry

    Opposite = 11cm, hypotenuse = 22cm. Find the angle

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

    Find 54% of 119

    Answer: 64.26
  5. 5. Statistics

    Find the range of: 21, 11, 6, 6, 28

    Answer: 22

Friday 22 May 2026

Keystones #142 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 85 + ? = 135

    Answer: 50
  2. 2. Algebra

    Solve: x + 6 = 17

    Answer: x = 11
  3. 3. Geometry

    Calculate the area of a circle with diameter 10cm

    Answer: 78.54cm²
  4. 4. Ratio

    Simplify: 12:12:4

    Answer: 3:3:1
  5. 5. Statistics

    Find the mean of: 15, 12, 13

    Answer: 13.333333333333