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Lintel Apr 9 - 15 25 questions
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Monday 6 April 2026

Keystones #96 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 77 + ? = 120

    Answer: 43
  2. 2. Algebra

    What is the next term? 3, 12, 48, 192, ...

    Answer: 768
  3. 3. Geometry

    Opposite = 18cm, adjacent = 13cm. Calculate the angle

    Answer: 54.2°
  4. 4. Ratio

    Simplify: 8:8:6

    Answer: 4:4:3
  5. 5. Statistics

    A bag has 7 red and 6 blue balls. What is the probability of picking a red ball?

    Answer: 7⁄13

Tuesday 7 April 2026

Keystones #97 · Five questions · Open this day only

  1. 1. Number

    The sum of three consecutive numbers is 150. What are the numbers?

    Answer: 49, 50, and 51
  2. 2. Algebra

    Solve: x⁄4 = 7.5

    Answer: x = 30
  3. 3. Geometry

    A right triangle has hypotenuse 10cm and one side 6cm. Find its area

    Answer: 24cm²
  4. 4. Ratio

    Simplify: 6:6:10

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

    Find the range of: -11, 14, -5, 37, 21

    Answer: 48

Wednesday 8 April 2026

Keystones #98 · Five questions · Open this day only

  1. 1. Number

    The sum of three consecutive numbers is 93. What are the numbers?

    Answer: 30, 31, and 32
  2. 2. Algebra

    Find the next term: 1, 4, 10, 19, ...

    Answer: 31
  3. 3. Geometry

    Find the distance between (-5, -5) and (8, 8)

    Answer: 18.38
  4. 4. Ratio

    Simplify: 6:4:6

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

    A spinner has 3 red, 4 blue and 2 green sections. Probability of landing on red?

    Answer: 1⁄3

Thursday 9 April 2026

Keystones #99 · Five questions · Open this day only

  1. 1. Number

    Calculate: 814 + 501

    Answer: 814 + 501 = 1315
  2. 2. Algebra

    What is the next term? 7, 21, 63, 189, ...

    Answer: 567
  3. 3. Geometry

    Opposite = 18cm, adjacent = 11cm. Calculate the angle

    Answer: 58.6°
  4. 4. Ratio

    Simplify: 8:6:6

    Answer: 4:3:3
  5. 5. Statistics

    Calculate the mean of: 34, 46, 10, 10, 35, 47

    Answer: 30.3

Friday 10 April 2026

Keystones #100 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 72 + ? = 113

    Answer: 41
  2. 2. Algebra

    Factorise: 2x² + 4x

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

    Find c if a = 9cm and b = 20cm in a right triangle

    Answer: 21.9cm
  4. 4. Ratio

    Find 70% of 56

    Answer: 39.2
  5. 5. Statistics

    Calculate the mean of: 22, 7, 40, 34, 37, 16, 28, 37

    Answer: 27.6