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Lintel May 18 - 24 25 questions
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Monday 18 May 2026

Keystones #138 · Five questions · Open this day only

  1. 1. Number

    Round 3950 to 2 significant figures

    Answer: 4000
  2. 2. Algebra

    Find the nth term: 26, 24, 22, 20, ...

    Answer: 28 - 2n
  3. 3. Geometry

    Calculate area: sides 12cm and 14cm, included angle 60°

    Answer: 72.7cm²
  4. 4. Ratio

    8 kg costs £32.20. What is the cost of 17 kg?

    Answer: £68.43
  5. 5. Statistics

    What are the modes of: 28, 36, 16, 16, 36, 16

    Answer: 16 and 36

Tuesday 19 May 2026

Keystones #139 · Five questions · Open this day only

  1. 1. Number

    Round 39.209 to 3 significant figures

    Answer: 39.2
  2. 2. Algebra

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

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

    Find area of triangle: a = 24cm, b = 27cm, angle = 76°

    Answer: 314.4cm²
  4. 4. Ratio

    7 kg costs £38.20. What is the cost of 23 kg?

    Answer: £125.51
  5. 5. Statistics

    Find the mode of: 48, 17, 57, 35, 76

    Answer: No mode

Wednesday 20 May 2026

Keystones #140 · Five questions · Open this day only

  1. 1. Number

    Round 9204 to 2 significant figures

    Answer: 9200
  2. 2. Algebra

    Determine the nth term rule: -7, -4, -1, 2, 5, ...

    Answer: 3n + -10
  3. 3. Geometry

    Calculate area: sides 10cm and 23cm, included angle 30°

    Answer: 57.5cm²
  4. 4. Ratio

    5 kg costs £28.10. What is the cost of 19 kg?

    Answer: £106.78
  5. 5. Statistics

    What are the modes of: 17, 19, 34, 29, 34, 19

    Answer: 19 and 34

Thursday 21 May 2026

Keystones #141 · Five questions · Open this day only

  1. 1. Number

    Round 86.116 to 3 significant figures

    Answer: 86.1
  2. 2. Algebra

    Find the nth term: 29, 26, 23, 20, ...

    Answer: 32 - 3n
  3. 3. Geometry

    Find area of triangle: a = 28cm, b = 24cm, angle = 75°

    Answer: 324.6cm²
  4. 4. Ratio

    10 kg costs £10.00. What is the cost of 17 kg?

    Answer: £17.00
  5. 5. Statistics

    Find the mode of: 10, 48, 74, 35, 64

    Answer: No mode

Friday 22 May 2026

Keystones #142 · Five questions · Open this day only

  1. 1. Number

    Round 7850 to 2 significant figures

    Answer: 7900
  2. 2. Algebra

    Find the nth term: 17, 15, 13, 11, ...

    Answer: 19 - 2n
  3. 3. Geometry

    Calculate area: sides 16cm and 24cm, included angle 30°

    Answer: 96cm²
  4. 4. Ratio

    9 kg costs £49.50. What is the cost of 20 kg?

    Answer: £110.00
  5. 5. Statistics

    Find the mode of: 42, 71, 65, 13, 26

    Answer: No mode