Change pack
Cornerstone Apr 27 - May 3 25 questions
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Monday 27 April 2026

Keystones #117 · Five questions · Open this day only

  1. 1. Number

    Round 9217 to 2 significant figures

    Answer: 9200
  2. 2. Algebra

    Factorise: 4x² + 4x

    Answer: 4x(x + 1)
  3. 3. Geometry

    A car travels at 20km/h for 4 hours. How far does it travel?

    Answer: 80km
  4. 4. Ratio

    Decrease 107 by 13%

    Answer: 93.09
  5. 5. Statistics

    What is the probability of rolling a 2 on a fair die?

    Answer: 1⁄6

Tuesday 28 April 2026

Keystones #118 · Five questions · Open this day only

  1. 1. Number

    Round 1343 to 2 significant figures

    Answer: 1300
  2. 2. Algebra

    Factorise: 9x² + 4x

    Answer: x(9x + 4)
  3. 3. Geometry

    A car travels at 73km/h for 2 hours. How far does it travel?

    Answer: 146km
  4. 4. Ratio

    Decrease 436 by 38%

    Answer: 270.32
  5. 5. Statistics

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

    Answer: 1⁄2

Wednesday 29 April 2026

Keystones #119 · Five questions · Open this day only

  1. 1. Number

    Round 239 to 1 significant figure

    Answer: 200
  2. 2. Algebra

    Factorise: 12x + 30

    Answer: 6(2x + 5)
  3. 3. Geometry

    A cyclist travels 257km in 7 hours. What is their average speed?

    Answer: 36.714285714286km/h
  4. 4. Ratio

    Decrease 432 by 21%

    Answer: 341.28
  5. 5. Statistics

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

    Answer: 2⁄5

Thursday 30 April 2026

Keystones #120 · Five questions · Open this day only

  1. 1. Number

    Round 632 to 1 significant figure

    Answer: 600
  2. 2. Algebra

    Factorise: 32x + 28

    Answer: 4(8x + 7)
  3. 3. Geometry

    A car travels at 27km/h for 5 hours. How far does it travel?

    Answer: 135km
  4. 4. Ratio

    Decrease 446 by 24%

    Answer: 338.96
  5. 5. Statistics

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

    Answer: 1⁄2

Friday 1 May 2026

Keystones #121 · Five questions · Open this day only

  1. 1. Number

    Round 4908 to 2 significant figures

    Answer: 4900
  2. 2. Algebra

    Factorise: 5x² + 9x

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

    A cyclist travels 225km in 3 hours. What is their average speed?

    Answer: 75km/h
  4. 4. Ratio

    Decrease 374 by 28%

    Answer: 269.28
  5. 5. Statistics

    A bag has 7 red and 4 blue balls. What is the probability of picking a red ball?

    Answer: 7⁄11