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Lintel Mar 30 - Apr 5 25 questions
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Monday 30 March 2026

Keystones #89 · Five questions · Open this day only

  1. 1. Number

    Round 6885 to 2 significant figures

    Answer: 6900
  2. 2. Algebra

    Find the nth term: 31, 27, 23, 19, ...

    Answer: 35 - 4n
  3. 3. Geometry

    Calculate area: sides 25cm and 24cm, included angle 30°

    Answer: 150cm²
  4. 4. Ratio

    5 kg costs £46.50. What is the cost of 22 kg?

    Answer: £204.60
  5. 5. Statistics

    Find the mode of: 50, 19, 76, 55, 25

    Answer: No mode

Tuesday 31 March 2026

Keystones #90 · Five questions · Open this day only

  1. 1. Number

    Round 39.772 to 3 significant figures

    Answer: 39.8
  2. 2. Algebra

    Determine the nth term rule: -1, 6, 13, 20, 27, ...

    Answer: 7n + -8
  3. 3. Geometry

    Find area of triangle: a = 15cm, b = 30cm, angle = 72°

    Answer: 214cm²
  4. 4. Ratio

    6 kg costs £40.40. What is the cost of 16 kg?

    Answer: £107.73
  5. 5. Statistics

    What are the modes of: 15, 33, 33, 15, 30, 18

    Answer: 15 and 33

Wednesday 1 April 2026

Keystones #91 · Five questions · Open this day only

  1. 1. Number

    Round 5528 to 2 significant figures

    Answer: 5500
  2. 2. Algebra

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

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

    Find area of triangle: a = 20cm, b = 13cm, angle = 51°

    Answer: 101cm²
  4. 4. Ratio

    If 11 items cost £31.50, how many items can you buy for £26.20?

    Answer: 9.1 items
  5. 5. Statistics

    What are the modes of: 34, 34, 16, 12, 12, 27

    Answer: 12 and 34

Thursday 2 April 2026

Keystones #92 · Five questions · Open this day only

  1. 1. Number

    Round 88.765 to 3 significant figures

    Answer: 88.8
  2. 2. Algebra

    Determine the nth term rule: -2, 4, 10, 16, 22, ...

    Answer: 6n + -8
  3. 3. Geometry

    Calculate area: sides 19cm and 22cm, included angle 60°

    Answer: 181cm²
  4. 4. Ratio

    If 9 items cost £28.20, how many items can you buy for £36.20?

    Answer: 11.6 items
  5. 5. Statistics

    What are the modes of: 34, 11, 25, 27, 11, 34

    Answer: 11 and 34

Friday 3 April 2026

Keystones #93 · Five questions · Open this day only

  1. 1. Number

    Round 2584 to 2 significant figures

    Answer: 2600
  2. 2. Algebra

    Find the nth term: 14, 11, 8, 5, ...

    Answer: 17 - 3n
  3. 3. Geometry

    Find area of triangle: a = 21cm, b = 29cm, angle = 40°

    Answer: 195.7cm²
  4. 4. Ratio

    If 9 items cost £29.20, how many items can you buy for £41.50?

    Answer: 12.8 items
  5. 5. Statistics

    Find the mode of: 79, 25, 42, 14, 58

    Answer: No mode