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Cornerstone Jan 19 - 25 25 questions
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Monday 19 January 2026

Keystones #19 · Five questions · Open this day only

  1. 1. Number

    Round 1840 to 2 significant figures

    Answer: 1800
  2. 2. Algebra

    Factorise: 2x² + 5x

    Answer: x(2x + 5)
  3. 3. Geometry

    A car travels at 27km/h for 2 hours. How far does it travel?

    Answer: 54km
  4. 4. Ratio

    Increase 176 by 20%

    Answer: 211.2
  5. 5. Statistics

    A bag has 4 red and 8 blue balls. What is the probability of picking a red ball?

    Answer: 1⁄3

Tuesday 20 January 2026

Keystones #20 · Five questions · Open this day only

  1. 1. Number

    Round 359 to 1 significant figure

    Answer: 300
  2. 2. Algebra

    Factorise: 5x² + 9x

    Answer: x(5x + 9)
  3. 3. Geometry

    A cyclist travels 153km in 5 hours. What is their average speed?

    Answer: 30.6km/h
  4. 4. Ratio

    Increase 183 by 50%

    Answer: 274.5
  5. 5. Statistics

    What is the probability of rolling a 6 on a fair die?

    Answer: 1⁄6

Wednesday 21 January 2026

Keystones #21 · Five questions · Open this day only

  1. 1. Number

    Round 6701 to 2 significant figures

    Answer: 6700
  2. 2. Algebra

    Factorise: 30x + 36

    Answer: 6(5x + 6)
  3. 3. Geometry

    A car travels at 26km/h for 2 hours. How far does it travel?

    Answer: 52km
  4. 4. Ratio

    Increase 199 by 50%

    Answer: 298.5
  5. 5. Statistics

    A bag has 5 red and 3 blue balls. What is the probability of picking a red ball?

    Answer: 5⁄8

Thursday 22 January 2026

Keystones #22 · Five questions · Open this day only

  1. 1. Number

    Round 689 to 1 significant figure

    Answer: 600
  2. 2. Algebra

    Factorise: 15x + 35

    Answer: 5(3x + 7)
  3. 3. Geometry

    A cyclist travels 316km in 7 hours. What is their average speed?

    Answer: 45.142857142857km/h
  4. 4. Ratio

    Increase 61 by 20%

    Answer: 73.2
  5. 5. Statistics

    A bag has 7 red and 6 blue balls. What is the probability of picking a red ball?

    Answer: 7⁄13

Friday 23 January 2026

Keystones #23 · Five questions · Open this day only

  1. 1. Number

    Round 7932 to 2 significant figures

    Answer: 7900
  2. 2. Algebra

    Factorise: 5x² + 8x

    Answer: x(5x + 8)
  3. 3. Geometry

    A car travels at 40km/h for 5 hours. How far does it travel?

    Answer: 200km
  4. 4. Ratio

    Increase 68 by 10%

    Answer: 74.8
  5. 5. Statistics

    What is the probability of getting heads when flipping a fair coin?

    Answer: 1⁄2