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Lintel Feb 9 - 15 25 questions
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Monday 9 February 2026

Keystones #40 · Five questions · Open this day only

  1. 1. Number

    Round 82.287 to 3 significant figures

    Answer: 82.3
  2. 2. Algebra

    Determine the nth term rule: -1, 2, 5, 8, 11, ...

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

    Find area of triangle: a = 29cm, b = 20cm, angle = 76°

    Answer: 281.4cm²
  4. 4. Ratio

    If 11 items cost £21.60, how many items can you buy for £20.50?

    Answer: 10.4 items
  5. 5. Statistics

    What are the modes of: 18, 37, 15, 30, 18, 37

    Answer: 18 and 37

Tuesday 10 February 2026

Keystones #41 · Five questions · Open this day only

  1. 1. Number

    Round 25.833 to 3 significant figures

    Answer: 25.8
  2. 2. Algebra

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

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

    Calculate area: sides 24cm and 21cm, included angle 30°

    Answer: 126cm²
  4. 4. Ratio

    If 7 items cost £23.30, how many items can you buy for £26.20?

    Answer: 7.9 items
  5. 5. Statistics

    What are the modes of: 32, 17, 17, 16, 32, 34

    Answer: 17 and 32

Wednesday 11 February 2026

Keystones #42 · Five questions · Open this day only

  1. 1. Number

    Round 2319 to 2 significant figures

    Answer: 2300
  2. 2. Algebra

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

    Answer: 35 - 4n
  3. 3. Geometry

    Find area of triangle: a = 15cm, b = 22cm, angle = 51°

    Answer: 128.2cm²
  4. 4. Ratio

    If 9 items cost £25.40, how many items can you buy for £51.20?

    Answer: 18.1 items
  5. 5. Statistics

    Find the mode of: 31, 50, 71, 12, 65

    Answer: No mode

Thursday 12 February 2026

Keystones #43 · Five questions · Open this day only

  1. 1. Number

    Round 53.596 to 3 significant figures

    Answer: 53.6
  2. 2. Algebra

    Find the nth term: 32, 28, 24, 20, ...

    Answer: 36 - 4n
  3. 3. Geometry

    Calculate area: sides 20cm and 10cm, included angle 60°

    Answer: 86.6cm²
  4. 4. Ratio

    If 11 items cost £20.20, how many items can you buy for £32.80?

    Answer: 17.9 items
  5. 5. Statistics

    Find the mode of: 80, 62, 19, 30, 45

    Answer: No mode

Friday 13 February 2026

Keystones #44 · Five questions · Open this day only

  1. 1. Number

    Round 6968 to 2 significant figures

    Answer: 7000
  2. 2. Algebra

    Determine the nth term rule: 4, 10, 16, 22, 28, ...

    Answer: 6n + -2
  3. 3. Geometry

    Find area of triangle: a = 28cm, b = 17cm, angle = 79°

    Answer: 233.6cm²
  4. 4. Ratio

    If 8 items cost £31.30, how many items can you buy for £50.10?

    Answer: 12.8 items
  5. 5. Statistics

    What are the modes of: 31, 31, 13, 20, 31, 13

    Answer: 13 and 31