Change pack
Cornerstone Jun 15 - 21 25 questions
PDF (questions) PDF (answers)

Monday 15 June 2026

Keystones #166 · Five questions · Open this day only

  1. 1. Number

    Round 1659 to 2 significant figures

    Answer: 1700
  2. 2. Algebra

    Factorise: 40x + 35

    Answer: 5(8x + 7)
  3. 3. Geometry

    A cyclist travels 360km in 4 hours. What is their average speed?

    Answer: 90km/h
  4. 4. Ratio

    Increase 172 by 25%

    Answer: 215
  5. 5. Statistics

    What is the probability of rolling a 1 on a fair die?

    Answer: 1⁄6

Tuesday 16 June 2026

Keystones #167 · Five questions · Open this day only

  1. 1. Number

    Round 564 to 1 significant figure

    Answer: 500
  2. 2. Algebra

    Factorise: 15x + 21

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

    A car travels at 71km/h for 5 hours. How far does it travel?

    Answer: 355km
  4. 4. Ratio

    Increase 173 by 20%

    Answer: 207.6
  5. 5. Statistics

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

    Answer: 5⁄12

Wednesday 17 June 2026

Keystones #168 · Five questions · Open this day only

  1. 1. Number

    Round 9088 to 2 significant figures

    Answer: 9100
  2. 2. Algebra

    Factorise: 6x² + 7x

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

    A cyclist travels 358km in 3 hours. What is their average speed?

    Answer: 119.33333333333km/h
  4. 4. Ratio

    Increase 153 by 25%

    Answer: 191.25
  5. 5. Statistics

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

    Answer: 6⁄13

Thursday 18 June 2026

Keystones #169 · Five questions · Open this day only

  1. 1. Number

    Round 8896 to 2 significant figures

    Answer: 8900
  2. 2. Algebra

    Factorise: 8x² + 3x

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

    A cyclist travels 143km in 8 hours. What is their average speed?

    Answer: 17.875km/h
  4. 4. Ratio

    Increase 77 by 10%

    Answer: 84.7
  5. 5. Statistics

    A bag has 5 red and 4 blue balls. What is the probability of picking a red ball?

    Answer: 5⁄9

Friday 19 June 2026

Keystones #170 · Five questions · Open this day only

  1. 1. Number

    Round 514 to 1 significant figure

    Answer: 500
  2. 2. Algebra

    Factorise: 25x + 15

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

    A car travels at 23km/h for 3 hours. How far does it travel?

    Answer: 69km
  4. 4. Ratio

    Increase 159 by 50%

    Answer: 238.5
  5. 5. Statistics

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

    Answer: 1⁄2