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Cornerstone Apr 2 - 8 25 questions
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Monday 6 April 2026

Keystones #96 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 75 + ? = 168

    Answer: 93
  2. 2. Algebra

    Collect like terms: 5x + 6y + 6x + 6y

    Answer: 11x + 12y
  3. 3. Geometry

    Find the area of a circle with radius 5cm

    Answer: 78.54cm²
  4. 4. Ratio

    Simplify: 12:15:6

    Answer: 4:5:2
  5. 5. Statistics

    Find the mean of: 20, 5, 19

    Answer: 14.666666666667

Tuesday 7 April 2026

Keystones #97 · Five questions · Open this day only

  1. 1. Number

    Calculate: 4⁄7 + 1⁄7

    Answer: 5⁄7
  2. 2. Algebra

    Find the next term: 12, 19, 26, 33, ...

    Answer: 40
  3. 3. Geometry

    Calculate the area of a circle with diameter 13cm

    Answer: 132.73cm²
  4. 4. Ratio

    Simplify: 24:12:12

    Answer: 2:1:1
  5. 5. Statistics

    Calculate the range of: 60, 38, 62, 77, 54, 84

    Answer: 46

Wednesday 8 April 2026

Keystones #98 · Five questions · Open this day only

  1. 1. Number

    What is √25?

    Answer: 5
  2. 2. Algebra

    Solve: x + 10 = 22

    Answer: x = 12
  3. 3. Geometry

    Opposite = 10cm, adjacent = 19cm. Calculate the angle

    Answer: 27.8°
  4. 4. Ratio

    Simplify: 20:12:20

    Answer: 5:3:5
  5. 5. Statistics

    Calculate the mean of: 20, 50, 6, 19, 35, 45, 49, 43

    Answer: 33.4

Thursday 9 April 2026

Keystones #99 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 65 + ? = 108

    Answer: 43
  2. 2. Algebra

    Expand: 3(4x + 9)

    Answer: 12x + 27
  3. 3. Geometry

    Find the area of a circle with radius 10cm

    Answer: 314.16cm²
  4. 4. Ratio

    Simplify: 15:9:12

    Answer: 5:3:4
  5. 5. Statistics

    Find the range of: 30, 37, 17, 24, 29

    Answer: 20

Friday 10 April 2026

Keystones #100 · Five questions · Open this day only

  1. 1. Number

    Calculate: 394 + 144

    Answer: 394 + 144 = 538
  2. 2. Algebra

    What is the next term? 5, 15, 45, 135, ...

    Answer: 405
  3. 3. Geometry

    Opposite = 12cm, adjacent = 17cm. Calculate the angle

    Answer: 35.2°
  4. 4. Ratio

    Simplify: 6:9:18

    Answer: 2:3:6
  5. 5. Statistics

    Find the mean of: 18, 10, 5, 15

    Answer: 12