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Cornerstone Jan 15 - 21 25 questions
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Monday 19 January 2026

Keystones #19 · Five questions · Open this day only

  1. 1. Number

    84000

    Answer: 8.4 × 104
  2. 2. Algebra

    Solve: x + 4 = 18

    Answer: x = 14
  3. 3. Geometry

    Calculate the area of a circle with diameter 8cm

    Answer: 50.27cm²
  4. 4. Ratio

    Simplify the ratio 16:10

    Answer: 8:5
  5. 5. Statistics

    A bag has 3 red and 8 blue balls. What is the probability of picking a red ball?

    Answer: 3⁄11

Tuesday 20 January 2026

Keystones #20 · Five questions · Open this day only

  1. 1. Number

    Calculate: 9⁄11 + 1⁄11

    Answer: 10⁄11
  2. 2. Algebra

    Solve: x + 8 = 12

    Answer: x = 4
  3. 3. Geometry

    Opposite = 6cm, hypotenuse = 12cm. Find the angle

    Answer: 30° (approximately)
  4. 4. Ratio

    Simplify the ratio 40:15

    Answer: 8:3
  5. 5. Statistics

    Find the range of: 31, 28, 18, 18, 26

    Answer: 13

Wednesday 21 January 2026

Keystones #21 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 88 + ? = 180

    Answer: 92
  2. 2. Algebra

    For y = x³ + 2, calculate y when x = 2

    Answer: y = 10
  3. 3. Geometry

    Opposite = 15cm, adjacent = 14cm. Calculate the angle

    Answer: 47°
  4. 4. Ratio

    Simplify the ratio 21:18

    Answer: 7:6
  5. 5. Statistics

    Calculate the range of: 27, 62, 83, 58, 53, 23

    Answer: 60

Thursday 22 January 2026

Keystones #22 · Five questions · Open this day only

  1. 1. Number

    Calculate: 6⁄12 + 2⁄12

    Answer: 2⁄3
  2. 2. Algebra

    Collect like terms: 8x + 8y + 3x + 6y

    Answer: 11x + 14y
  3. 3. Geometry

    Opposite = 5cm, hypotenuse = 10cm. Find the angle

    Answer: 30° (approximately)
  4. 4. Ratio

    Simplify the ratio 15:25

    Answer: 3:5
  5. 5. Statistics

    Calculate the range of: 51, 28, 28, 65, 60, 48

    Answer: 37

Friday 23 January 2026

Keystones #23 · Five questions · Open this day only

  1. 1. Number

    49000000

    Answer: 4.9 × 107
  2. 2. Algebra

    Simplify: 2x + 2x

    Answer: 4x
  3. 3. Geometry

    Opposite = 17cm, adjacent = 11cm. Calculate the angle

    Answer: 57.1°
  4. 4. Ratio

    Simplify the ratio 30:10

    Answer: 3:1
  5. 5. Statistics

    Find the range of: 15, 28, 36, 27, 15

    Answer: 21