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Cornerstone Aug 3 - 9 25 questions
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Monday 3 August 2026

Keystones #215 · Five questions · Open this day only

  1. 1. Number

    Round 468 to 1 significant figure

    Answer: 400
  2. 2. Algebra

    Factorise: 4x² + 7x

    Answer: x(4x + 7)
  3. 3. Geometry

    A car travels at 41km/h for 3 hours. How far does it travel?

    Answer: 123km
  4. 4. Ratio

    Decrease 257 by 24%

    Answer: 195.32
  5. 5. Statistics

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

    Answer: 1⁄2

Tuesday 4 August 2026

Keystones #216 · Five questions · Open this day only

  1. 1. Number

    Round 539 to 1 significant figure

    Answer: 500
  2. 2. Algebra

    Factorise: 2x² + 8x

    Answer: 2x(x + 4)
  3. 3. Geometry

    A car travels at 79km/h for 4 hours. How far does it travel?

    Answer: 316km
  4. 4. Ratio

    Increase 172 by 20%

    Answer: 206.4
  5. 5. Statistics

    A bag has 4 red and 6 blue balls. What is the probability of picking a red ball?

    Answer: 2⁄5

Wednesday 5 August 2026

Keystones #217 · Five questions · Open this day only

  1. 1. Number

    Round 2715 to 2 significant figures

    Answer: 2700
  2. 2. Algebra

    Factorise: 30x + 18

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

    A cyclist travels 207km in 7 hours. What is their average speed?

    Answer: 29.571428571429km/h
  4. 4. Ratio

    Increase 187 by 50%

    Answer: 280.5
  5. 5. Statistics

    What is the probability of rolling a 4 on a fair die?

    Answer: 1⁄6

Thursday 6 August 2026

Keystones #218 · Five questions · Open this day only

  1. 1. Number

    Round 503 to 1 significant figure

    Answer: 500
  2. 2. Algebra

    Factorise: 28x + 24

    Answer: 4(7x + 6)
  3. 3. Geometry

    A car travels at 50km/h for 2 hours. How far does it travel?

    Answer: 100km
  4. 4. Ratio

    Increase 184 by 25%

    Answer: 230
  5. 5. Statistics

    A bag has 5 red and 7 blue balls. What is the probability of picking a red ball?

    Answer: 5⁄12

Friday 7 August 2026

Keystones #219 · Five questions · Open this day only

  1. 1. Number

    Round 8857 to 2 significant figures

    Answer: 8900
  2. 2. Algebra

    Factorise: 9x² + 7x

    Answer: x(9x + 7)
  3. 3. Geometry

    A cyclist travels 313km in 3 hours. What is their average speed?

    Answer: 104.33333333333km/h
  4. 4. Ratio

    Increase 174 by 25%

    Answer: 217.5
  5. 5. Statistics

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

    Answer: 5⁄8