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Lintel Jan 15 - 21 25 questions
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Monday 12 January 2026

Keystones #12 · Five questions · Open this day only

  1. 1. Number

    Calculate: 1⁄4 + 1⁄2 + 2⁄5

    Answer: 23⁄20
  2. 2. Algebra

    Find the next term: 1, 3, 7, 13, ...

    Answer: 21
  3. 3. Geometry

    Calculate perimeter: two sides are 13cm and 13cm at right angles

    Answer: 44.4cm
  4. 4. Ratio

    Simplify: 10:10:8

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

    Calculate the mean of: 47, 20, 42, 48, 26, 5, 34, 50

    Answer: 34

Tuesday 13 January 2026

Keystones #13 · Five questions · Open this day only

  1. 1. Number

    Find the total of 248, 147, and 51

    Answer: 446
  2. 2. Algebra

    For y = x³ + 12, calculate y when x = 2

    Answer: y = 20
  3. 3. Geometry

    Find c if a = 16cm and b = 21cm in a right triangle

    Answer: 26.4cm
  4. 4. Ratio

    Find 50% of 454

    Answer: 227
  5. 5. Statistics

    A spinner has 2 red, 6 blue and 4 green sections. Probability of landing on red?

    Answer: 1⁄6

Wednesday 14 January 2026

Keystones #14 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 89 + ? = 133

    Answer: 44
  2. 2. Algebra

    Solve: 2x = 8

    Answer: x = 4
  3. 3. Geometry

    Find c if a = 16cm and b = 25cm in a right triangle

    Answer: 29.7cm
  4. 4. Ratio

    Simplify the ratio 5m:500cm

    Answer: 1:100
  5. 5. Statistics

    Calculate the mean of: 8, 45, 49, 14, 24, 9, 16, 25

    Answer: 23.8

Thursday 15 January 2026

Keystones #15 · 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

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

    Answer: 31
  3. 3. Geometry

    Calculate the distance between (3, 2) and (6, 6)

    Answer: 5
  4. 4. Ratio

    Calculate 41% of 925

    Answer: 379.25
  5. 5. Statistics

    A spinner has 5 red, 3 blue and 4 green sections. Probability of landing on red?

    Answer: 5⁄12

Friday 16 January 2026

Keystones #16 · Five questions · Open this day only

  1. 1. Number

    Find the total of 144, 279, and 52

    Answer: 475
  2. 2. Algebra

    Solve: x⁄3 = 12.333333333333

    Answer: x = 37
  3. 3. Geometry

    A circle has area 201.cm². Find its radius (dp)

    Answer: 8cm
  4. 4. Ratio

    Simplify the ratio 6m:600cm

    Answer: 1:100
  5. 5. Statistics

    A spinner has 6 red, 4 blue and 2 green sections. Probability of landing on red?

    Answer: 1⁄2