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Lintel Jan 15 - 21 25 questions
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Monday 19 January 2026

Keystones #19 · Five questions · Open this day only

  1. 1. Number

    Add: 2⁄5 + 1⁄6

    Answer: 17⁄30
  2. 2. Algebra

    For y = 4x³ + 19, find y when x = 4

    Answer: y = 275
  3. 3. Geometry

    Find c if a = 13cm and b = 15cm in a right triangle

    Answer: 19.8cm
  4. 4. Ratio

    Simplify the ratio 7m:700cm

    Answer: 1:100
  5. 5. Statistics

    Find the range of: -17, 48, -6, -9, 1

    Answer: 65

Tuesday 20 January 2026

Keystones #20 · Five questions · Open this day only

  1. 1. Number

    The sum of three consecutive numbers is 144. What are the numbers?

    Answer: 47, 48, and 49
  2. 2. Algebra

    Solve: 3x + 7 = x - 5

    Answer: x = 6
  3. 3. Geometry

    Calculate perimeter: two sides are 12cm and 6cm at right angles

    Answer: 31.4cm
  4. 4. Ratio

    Simplify the ratio 6m:600cm

    Answer: 1:100
  5. 5. Statistics

    A bag has 5 red and 3 blue balls. What is the probability of picking a red ball?

    Answer: 5⁄8

Wednesday 21 January 2026

Keystones #21 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 91 + ? = 143

    Answer: 52
  2. 2. Algebra

    Factorise: 7x² + 2x

    Answer: x(7x + 2)
  3. 3. Geometry

    Adjacent = 26cm, hypotenuse = 33cm. Find the angle

    Answer: 38°
  4. 4. Ratio

    Calculate 30.9% of 830

    Answer: 256.47
  5. 5. Statistics

    Find the range of: -8, 45, 9, -14, 14

    Answer: 59

Thursday 22 January 2026

Keystones #22 · Five questions · Open this day only

  1. 1. Number

    The sum of three consecutive numbers is 117. What are the numbers?

    Answer: 38, 39, and 40
  2. 2. Algebra

    Factorise: 7x² + 9x

    Answer: x(7x + 9)
  3. 3. Geometry

    Calculate the distance between (7, 3) and (10, 7)

    Answer: 5
  4. 4. Ratio

    Calculate 10.9% of 541

    Answer: 58.97
  5. 5. Statistics

    Find the range of: 27, 27, -10, -9, 12

    Answer: 37

Friday 23 January 2026

Keystones #23 · Five questions · Open this day only

  1. 1. Number

    Calculate: 826 + 566

    Answer: 826 + 566 = 1392
  2. 2. Algebra

    Solve: x⁄4 = 2.5

    Answer: x = 10
  3. 3. Geometry

    Find c if a = 20cm and b = 10cm in a right triangle

    Answer: 22.4cm
  4. 4. Ratio

    Calculate 47.4% of 831

    Answer: 393.89
  5. 5. Statistics

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

    Answer: 1⁄2