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Cornerstone Mar 9 - 15 25 questions
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Monday 9 March 2026

Keystones #68 · Five questions · Open this day only

  1. 1. Number

    Round 965 to 1 significant figure

    Answer: 900
  2. 2. Algebra

    Factorise: 9x² + 9x

    Answer: 9x(x + 1)
  3. 3. Geometry

    A cyclist travels 125km in 8 hours. What is their average speed?

    Answer: 15.625km/h
  4. 4. Ratio

    Decrease 136 by 18%

    Answer: 111.52
  5. 5. Statistics

    A bag has 7 red and 8 blue balls. What is the probability of picking a red ball?

    Answer: 7⁄15

Tuesday 10 March 2026

Keystones #69 · Five questions · Open this day only

  1. 1. Number

    Round 522 to 1 significant figure

    Answer: 500
  2. 2. Algebra

    Factorise: 9x² + 4x

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

    A car travels at 35km/h for 5 hours. How far does it travel?

    Answer: 175km
  4. 4. Ratio

    Decrease 224 by 20%

    Answer: 179.2
  5. 5. Statistics

    A bag has 4 red and 3 blue balls. What is the probability of picking a red ball?

    Answer: 4⁄7

Wednesday 11 March 2026

Keystones #70 · Five questions · Open this day only

  1. 1. Number

    Round 4060 to 2 significant figures

    Answer: 4100
  2. 2. Algebra

    Factorise: 12x + 15

    Answer: 3(4x + 5)
  3. 3. Geometry

    A cyclist travels 392km in 3 hours. What is their average speed?

    Answer: 130.66666666667km/h
  4. 4. Ratio

    Decrease 186 by 14%

    Answer: 159.96
  5. 5. Statistics

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

    Answer: 1⁄6

Thursday 12 March 2026

Keystones #71 · Five questions · Open this day only

  1. 1. Number

    Round 240 to 1 significant figure

    Answer: 200
  2. 2. Algebra

    Factorise: 15x + 40

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

    A car travels at 49km/h for 3 hours. How far does it travel?

    Answer: 147km
  4. 4. Ratio

    Decrease 275 by 39%

    Answer: 167.75
  5. 5. Statistics

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

    Answer: 1⁄2

Friday 13 March 2026

Keystones #72 · Five questions · Open this day only

  1. 1. Number

    Round 6906 to 2 significant figures

    Answer: 6900
  2. 2. Algebra

    Factorise: 5x² + 3x

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

    A cyclist travels 380km in 6 hours. What is their average speed?

    Answer: 63.333333333333km/h
  4. 4. Ratio

    Decrease 271 by 32%

    Answer: 184.28
  5. 5. Statistics

    A bag has 8 red and 6 blue balls. What is the probability of picking a red ball?

    Answer: 4⁄7