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Lintel Feb 12 - 18 25 questions
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Monday 9 February 2026

Keystones #40 · Five questions · Open this day only

  1. 1. Number

    The sum of three consecutive numbers is 114. What are the numbers?

    Answer: 37, 38, and 39
  2. 2. Algebra

    What is the next term? 2, 6, 18, 54, ...

    Answer: 162
  3. 3. Geometry

    Opposite = 20cm, adjacent = 9cm. Calculate the angle

    Answer: 65.8°
  4. 4. Ratio

    Simplify the ratio 5m:500cm

    Answer: 1:100
  5. 5. Statistics

    Find the range of: -23, 12, -16, 22, 3

    Answer: 45

Tuesday 10 February 2026

Keystones #41 · Five questions · Open this day only

  1. 1. Number

    Calculate: 995 + 769

    Answer: 1764
  2. 2. Algebra

    Solve: 8x = 64

    Answer: x = 8
  3. 3. Geometry

    Find c if a = 10cm and b = 18cm in a right triangle

    Answer: 20.6cm
  4. 4. Ratio

    Simplify the ratio 7m:700cm

    Answer: 1:100
  5. 5. Statistics

    Find the range of: 23, -29, -13, 22, -1

    Answer: 52

Wednesday 11 February 2026

Keystones #42 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄6 + 3⁄8

    Answer: 17⁄24
  2. 2. Algebra

    Solve: x⁄4 = 5.5

    Answer: x = 22
  3. 3. Geometry

    Opposite = 18cm, adjacent = 8cm. Calculate the angle

    Answer: 66°
  4. 4. Ratio

    Calculate 39.2% of 286

    Answer: 112.11
  5. 5. Statistics

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

    Answer: 2⁄5

Thursday 12 February 2026

Keystones #43 · Five questions · Open this day only

  1. 1. Number

    Calculate: 995 + 858

    Answer: 1853
  2. 2. Algebra

    Solve: x⁄4 = 7.75

    Answer: x = 31
  3. 3. Geometry

    A right triangle has hypotenuse 13cm and one side 5cm. Find its area

    Answer: 30cm²
  4. 4. Ratio

    Calculate 35.7% of 557

    Answer: 198.85
  5. 5. Statistics

    A bag has 5 red and 7 blue balls. What is the probability of picking a red ball?

    Answer: 5⁄12

Friday 13 February 2026

Keystones #44 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 52 + ? = 143

    Answer: 91
  2. 2. Algebra

    Factorise: 4x² + 2x

    Answer: 2x(2x + 1)
  3. 3. Geometry

    Opposite = 19cm, adjacent = 11cm. Calculate the angle

    Answer: 59.9°
  4. 4. Ratio

    Simplify the ratio 3m:300cm

    Answer: 1:100
  5. 5. Statistics

    Find the range of: 29, -24, -17, 40, 24

    Answer: 64