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Cornerstone Feb 19 - 25 25 questions
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Monday 16 February 2026

Keystones #47 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 56 + ? = 168

    Answer: 112
  2. 2. Algebra

    Factorise: 12x + 18

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

    Find the area of a circle with radius 3cm

    Answer: 28.27cm²
  4. 4. Ratio

    Simplify: 24:20:8

    Answer: 6:5:2
  5. 5. Statistics

    Calculate the mean of: 17, 34, 50, 33, 7, 16, 25

    Answer: 26

Tuesday 17 February 2026

Keystones #48 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄10 + 6⁄10

    Answer: 4⁄5
  2. 2. Algebra

    Factorise: 5x² + 7x

    Answer: x(5x + 7)
  3. 3. Geometry

    Opposite = 13cm, adjacent = 12cm. Calculate the angle

    Answer: 47.3°
  4. 4. Ratio

    Simplify: 20:8:8

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

    What is the probability of rolling a 1 on a fair die?

    Answer: 1⁄6

Wednesday 18 February 2026

Keystones #49 · Five questions · Open this day only

  1. 1. Number

    Calculate: 87 + 50

    Answer: 87 + 50 = 137
  2. 2. Algebra

    Collect like terms: 6x + 7y + 6x + 3y

    Answer: 12x + 10y
  3. 3. Geometry

    Opposite = 11cm, adjacent = 9cm. Calculate the angle

    Answer: 50.7°
  4. 4. Ratio

    Simplify: 12:8:12

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

    Find the range of: 18, 17, 28, 26, 19

    Answer: 11

Thursday 19 February 2026

Keystones #50 · Five questions · Open this day only

  1. 1. Number

    Calculate: 13 + (24)

    Answer: 37
  2. 2. Algebra

    Simplify: 7x + 6x

    Answer: 13x
  3. 3. Geometry

    Find the distance between (4, 4) and (10, 11)

    Answer: 9.22
  4. 4. Ratio

    Find 84% of 215

    Answer: 180.6
  5. 5. Statistics

    Calculate the mean of: 36, 24, 22, 33, 40, 14, 13, 11

    Answer: 24.1

Friday 20 February 2026

Keystones #51 · Five questions · Open this day only

  1. 1. Number

    Calculate: 47 + 65

    Answer: 47 + 65 = 112
  2. 2. Algebra

    Find the next term: 7, 11, 15, 19, ...

    Answer: 23
  3. 3. Geometry

    Calculate the area of a circle with diameter 24cm

    Answer: 452.39cm²
  4. 4. Ratio

    Find 21% of 279

    Answer: 58.59
  5. 5. Statistics

    What is the probability of getting heads when flipping a fair coin?

    Answer: 1⁄2