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Lintel Jun 22 - 28 25 questions
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Monday 22 June 2026

Keystones #173 · Five questions · Open this day only

  1. 1. Number

    A value is 56.9 (to dp). State the error interval

    Answer: 56.85 ≤ x < 56.95
  2. 2. Algebra

    Expand: (x + 8)(x - 8)

    Answer: x² + 0x - 64
  3. 3. Geometry

    A circle has area 254.5cm². Find its radius (dp)

    Answer: 9cm
  4. 4. Ratio

    Express 55 as a percentage of 280

    Answer: 19.64%
  5. 5. Statistics

    Find the mean, median and range of: 57, 92, 66, 45, 81, 82, 64, 70

    Answer: Mean = 69.6, Median = 70, Range = 47

Tuesday 23 June 2026

Keystones #174 · Five questions · Open this day only

  1. 1. Number

    24 is rounded to the nearest integer. What is the error interval?

    Answer: 23.5 ≤ x < 24.5
  2. 2. Algebra

    Expand: (x - 5)(x - 5)

    Answer: x² - 10x + 25
  3. 3. Geometry

    Calculate the area of a circle with diameter 23cm

    Answer: 415.48cm²
  4. 4. Ratio

    Express 49 as a percentage of 190

    Answer: 25.79%
  5. 5. Statistics

    Find the mean, mode, median and range of: 25, 46, 23, 22, 25

    Answer: Mean = 28.2, Mode = 25, Median = 25, Range = 24

Wednesday 24 June 2026

Keystones #175 · Five questions · Open this day only

  1. 1. Number

    75 is rounded to the nearest integer. What is the error interval?

    Answer: 74.5 ≤ x < 75.5
  2. 2. Algebra

    Expand: (x - 6)(x - 2)

    Answer: x² - 8x + 12
  3. 3. Geometry

    Calculate the area of a circle with diameter 17cm

    Answer: 226.98cm²
  4. 4. Ratio

    52 out of 89 students passed. What percentage passed?

    Answer: 58.4%
  5. 5. Statistics

    Find the mean, median and range of: 25, 41, 73, 16, 84, 17, 85, 15, 77

    Answer: Mean = 48.1, Median = 41, Range = 70

Thursday 25 June 2026

Keystones #176 · Five questions · Open this day only

  1. 1. Number

    A value is 26.9 (to dp). State the error interval

    Answer: 26.85 ≤ x < 26.95
  2. 2. Algebra

    Expand: (x + 4)(x - 8)

    Answer: x² -4x - 32
  3. 3. Geometry

    A circle has area 452.4cm². Find its radius (dp)

    Answer: 12cm
  4. 4. Ratio

    53 out of 71 students passed. What percentage passed?

    Answer: 74.6%
  5. 5. Statistics

    Find the mean, mode, median and range of: 38, 36, 45, 36, 22

    Answer: Mean = 35.4, Mode = 36, Median = 36, Range = 23

Friday 26 June 2026

Keystones #177 · Five questions · Open this day only

  1. 1. Number

    94 is rounded to the nearest integer. What is the error interval?

    Answer: 93.5 ≤ x < 94.5
  2. 2. Algebra

    Expand: (x + 6)(x - 2)

    Answer: x² + 4x - 12
  3. 3. Geometry

    Calculate the area of a circle with diameter 12cm

    Answer: 113.cm²
  4. 4. Ratio

    51 out of 100 students passed. What percentage passed?

    Answer: 51%
  5. 5. Statistics

    Find the mean, mode, median and range of: 28, 45, 43, 28, 14

    Answer: Mean = 31.6, Mode = 28, Median = 28, Range = 31