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Lintel Mar 12 - 18 25 questions
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Monday 9 March 2026

Keystones #68 · Five questions · Open this day only

  1. 1. Number

    Calculate: 998 + 826

    Answer: 1824
  2. 2. Algebra

    Solve: x⁄6 = 6.6666666666667

    Answer: x = 40
  3. 3. Geometry

    Calculate the area of a right triangle with perpendicular sides 10cm and 8cm

    Answer: 40cm²
  4. 4. Ratio

    Simplify: 24:16:16

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

    Find the range of: -23, -21, 23, 11, 27

    Answer: 50

Tuesday 10 March 2026

Keystones #69 · Five questions · Open this day only

  1. 1. Number

    The sum of three consecutive numbers is 102. What are the numbers?

    Answer: 33, 34, and 35
  2. 2. Algebra

    Solve: x⁄2 = 9

    Answer: x = 18
  3. 3. Geometry

    Adjacent = 14cm, hypotenuse = 22cm. Find the angle

    Answer: 50.5°
  4. 4. Ratio

    Simplify: 6:8:6

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

    Find the range of: -17, -4, -7, 0, 33

    Answer: 50

Wednesday 11 March 2026

Keystones #70 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 89 + ? = 195

    Answer: 106
  2. 2. Algebra

    Solve: 4x = 24

    Answer: x = 6
  3. 3. Geometry

    Opposite = 11cm, adjacent = 8cm. Calculate the angle

    Answer: 54°
  4. 4. Ratio

    Simplify: 12:12:9

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

    A bag has 3 red and 8 blue balls. What is the probability of picking a red ball?

    Answer: 3⁄11

Thursday 12 March 2026

Keystones #71 · Five questions · Open this day only

  1. 1. Number

    The sum of three consecutive numbers is 126. What are the numbers?

    Answer: 41, 42, and 43
  2. 2. Algebra

    Expand: 2(6x + 7)

    Answer: 12x + 14
  3. 3. Geometry

    Adjacent = 18cm, hypotenuse = 38cm. Find the angle

    Answer: 61.7°
  4. 4. Ratio

    Find 58% of 369

    Answer: 214.02
  5. 5. Statistics

    A bag has 6 red and 8 blue balls. What is the probability of picking a red ball?

    Answer: 3⁄7

Friday 13 March 2026

Keystones #72 · Five questions · Open this day only

  1. 1. Number

    Add: 1⁄6 + 2⁄8

    Answer: 5⁄12
  2. 2. Algebra

    Factorise fully: 20x² + 24x

    Answer: 4x(5x + 6)
  3. 3. Geometry

    Opposite = 17cm, adjacent = 15cm. Calculate the angle

    Answer: 48.6°
  4. 4. Ratio

    Simplify: 12:20:12

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

    Find the range of: -12, 32, -29, 13, -16

    Answer: 61