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Cornerstone Feb 12 - 18 25 questions
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Monday 9 February 2026

Keystones #40 · Five questions · Open this day only

  1. 1. Number

    Calculate: 72 + 80

    Answer: 72 + 80 = 152
  2. 2. Algebra

    Collect like terms: 3x + 8y + 4x + 8y

    Answer: 7x + 16y
  3. 3. Geometry

    Find the perimeter of a right triangle with sides 3cm, 4cm, 5cm

    Answer: 12cm
  4. 4. Ratio

    Simplify the ratio 21:24

    Answer: 7:8
  5. 5. Statistics

    A bag has 6 red and 4 blue balls. What is the probability of picking a red ball?

    Answer: 3⁄5

Tuesday 10 February 2026

Keystones #41 · Five questions · Open this day only

  1. 1. Number

    Calculate: 7⁄12 + 4⁄12

    Answer: 11⁄12
  2. 2. Algebra

    Solve: 4x = 36

    Answer: x = 9
  3. 3. Geometry

    Opposite = 13cm, adjacent = 15cm. Calculate the angle

    Answer: 40.9°
  4. 4. Ratio

    Calculate 50% of 187

    Answer: 93.5
  5. 5. Statistics

    A bag has 4 red and 6 blue balls. What is the probability of picking a red ball?

    Answer: 2⁄5

Wednesday 11 February 2026

Keystones #42 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 34 + ? = 104

    Answer: 70
  2. 2. Algebra

    Find the next term: 20, 29, 38, 47, ...

    Answer: 56
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 3cm and 4cm

    Answer: 5cm
  4. 4. Ratio

    Simplify the ratio 15:40

    Answer: 3:8
  5. 5. Statistics

    Find the range of: 44, 43, 29, 20, 26

    Answer: 24

Thursday 12 February 2026

Keystones #43 · Five questions · Open this day only

  1. 1. Number

    Calculate: 26 + 72

    Answer: 26 + 72 = 98
  2. 2. Algebra

    Solve: x + 11 = 27

    Answer: x = 16
  3. 3. Geometry

    Calculate the area of a circle with diameter 17cm

    Answer: 226.98cm²
  4. 4. Ratio

    Calculate 50% of 80

    Answer: 40
  5. 5. Statistics

    Find the mean of: 3, 5, 6

    Answer: 4.6666666666667

Friday 13 February 2026

Keystones #44 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 46 + ? = 194

    Answer: 148
  2. 2. Algebra

    Factorise: 5x² + 7x

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

    Find the area of a circle with radius 6cm

    Answer: 113.cm²
  4. 4. Ratio

    Simplify the ratio 15:24

    Answer: 5:8
  5. 5. Statistics

    A bag has 6 red and 3 blue balls. What is the probability of picking a red ball?

    Answer: 2⁄3