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Cornerstone May 21 - 27 25 questions
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Monday 25 May 2026

Keystones #145 · Five questions · Open this day only

  1. 1. Number

    Calculate: 214 + 529

    Answer: 214 + 529 = 743
  2. 2. Algebra

    Factorise: 12x + 16

    Answer: 2(6x + 8)
  3. 3. Geometry

    Opposite = 8cm, adjacent = 9cm. Calculate the angle

    Answer: 41.6°
  4. 4. Ratio

    Calculate 25% of 196

    Answer: 49
  5. 5. Statistics

    A bag has 5 red and 3 blue balls. What is the probability of picking a red ball?

    Answer: 5⁄8

Tuesday 26 May 2026

Keystones #146 · Five questions · Open this day only

  1. 1. Number

    Calculate: 42 + 70

    Answer: 42 + 70 = 112
  2. 2. Algebra

    Simplify: 7x + 3x

    Answer: 10x
  3. 3. Geometry

    Opposite = 14cm, hypotenuse = 19.8cm. Find the angle

    Answer: 45° (approximately)
  4. 4. Ratio

    Calculate 25% of 110

    Answer: 27.5
  5. 5. Statistics

    Calculate the mean of: 5, 15, 37, 10, 35, 8, 8, 43

    Answer: 20.1

Wednesday 27 May 2026

Keystones #147 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 42 + ? = 103

    Answer: 61
  2. 2. Algebra

    Collect like terms: 2x + 6y + 3x + 2y

    Answer: 5x + 8y
  3. 3. Geometry

    Opposite = 19cm, adjacent = 13cm. Calculate the angle

    Answer: 55.6°
  4. 4. Ratio

    Simplify the ratio 10:14

    Answer: 5:7
  5. 5. Statistics

    Find the range of: 26, 31, 16, 27, 10

    Answer: 21

Thursday 28 May 2026

Keystones #148 · Five questions · Open this day only

  1. 1. Number

    Add: 4⁄5 + 1⁄4

    Answer: 21⁄20
  2. 2. Algebra

    Collect like terms: 4x + 7y + 6x + 4y

    Answer: 10x + 11y
  3. 3. Geometry

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

    Answer: 47.5°
  4. 4. Ratio

    Simplify the ratio 16:28

    Answer: 4:7
  5. 5. Statistics

    Find the mean of: 6, 7, 2, 10, 19

    Answer: 8.8

Friday 29 May 2026

Keystones #149 · Five questions · Open this day only

  1. 1. Number

    Calculate: 28 + 33

    Answer: 28 + 33 = 61
  2. 2. Algebra

    Find the next term: 6, 10, 14, 18, ...

    Answer: 22
  3. 3. Geometry

    Find the distance between (3, 5) and (9, 12)

    Answer: 9.22
  4. 4. Ratio

    Simplify the ratio 15:40

    Answer: 3:8
  5. 5. Statistics

    Calculate the mean of: 27, 24, 13, 16, 44, 21, 10, 16

    Answer: 21.4