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Lintel Oct 12 - 18 25 questions
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Monday 12 October 2026

Keystones #285 · Five questions · Open this day only

  1. 1. Number

    Round 1839 to 2 significant figures

    Answer: 1800
  2. 2. Algebra

    Determine the nth term rule: 1, 5, 9, 13, 17, ...

    Answer: 4n + -3
  3. 3. Geometry

    Calculate area: sides 24cm and 10cm, included angle 30°

    Answer: 60cm²
  4. 4. Ratio

    If 10 items cost £39.40, how many items can you buy for £49.30?

    Answer: 12.5 items
  5. 5. Statistics

    Find the mode of: 12, 28, 65, 80, 45

    Answer: No mode

Tuesday 13 October 2026

Keystones #286 · Five questions · Open this day only

  1. 1. Number

    Round 19.467 to 3 significant figures

    Answer: 19.5
  2. 2. Algebra

    Find the nth term: 14, 8, 2, -4, ...

    Answer: 20 - 6n
  3. 3. Geometry

    Find area of triangle: a = 14cm, b = 16cm, angle = 76°

    Answer: 108.7cm²
  4. 4. Ratio

    If 7 items cost £17.20, how many items can you buy for £28.30?

    Answer: 11.5 items
  5. 5. Statistics

    What are the modes of: 29, 20, 37, 15, 37, 15

    Answer: 15 and 37

Wednesday 14 October 2026

Keystones #287 · Five questions · Open this day only

  1. 1. Number

    Round 91.05 to 3 significant figures

    Answer: 91.1
  2. 2. Algebra

    Find the nth term: 32, 29, 26, 23, ...

    Answer: 35 - 3n
  3. 3. Geometry

    Find area of triangle: a = 20cm, b = 28cm, angle = 62°

    Answer: 247.2cm²
  4. 4. Ratio

    10 kg costs £38.90. What is the cost of 21 kg?

    Answer: £81.69
  5. 5. Statistics

    Find the mode of: 40, 31, 62, 78, 12

    Answer: No mode

Thursday 15 October 2026

Keystones #288 · Five questions · Open this day only

  1. 1. Number

    Round 8785 to 2 significant figures

    Answer: 8800
  2. 2. Algebra

    Determine the nth term rule: -2, 3, 8, 13, 18, ...

    Answer: 5n + -7
  3. 3. Geometry

    Calculate area: sides 10cm and 11cm, included angle 60°

    Answer: 47.6cm²
  4. 4. Ratio

    8 kg costs £38.80. What is the cost of 25 kg?

    Answer: £121.25
  5. 5. Statistics

    What are the modes of: 33, 20, 16, 20, 33, 26

    Answer: 20 and 33

Friday 16 October 2026

Keystones #289 · Five questions · Open this day only

  1. 1. Number

    Round 92.148 to 3 significant figures

    Answer: 92.1
  2. 2. Algebra

    Determine the nth term rule: -2, 5, 12, 19, 26, ...

    Answer: 7n + -9
  3. 3. Geometry

    Find area of triangle: a = 24cm, b = 13cm, angle = 55°

    Answer: 127.8cm²
  4. 4. Ratio

    7 kg costs £35.90. What is the cost of 19 kg?

    Answer: £97.44
  5. 5. Statistics

    What are the modes of: 19, 35, 35, 21, 19, 35

    Answer: 19 and 35