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Cornerstone Mar 19 - 25 25 questions
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Monday 16 March 2026

Keystones #75 · Five questions · Open this day only

  1. 1. Number

    Add: 1⁄3 + 4⁄8

    Answer: 5⁄6
  2. 2. Algebra

    Solve: 9x = 108

    Answer: x = 12
  3. 3. Geometry

    Find the perimeter of a right triangle with sides 6cm and 8cm

    Answer: 24cm
  4. 4. Ratio

    Calculate 25% of 184

    Answer: 46
  5. 5. Statistics

    Calculate the range of: 47, 59, 96, 78, 46, 96

    Answer: 50

Tuesday 17 March 2026

Keystones #76 · Five questions · Open this day only

  1. 1. Number

    Calculate: -2 + 8

    Answer: 6
  2. 2. Algebra

    Solve: x + 8 = 27

    Answer: x = 19
  3. 3. Geometry

    Opposite = 19cm, adjacent = 13cm. Calculate the angle

    Answer: 55.6°
  4. 4. Ratio

    Calculate 50% of 174

    Answer: 87
  5. 5. Statistics

    Find the mean of: 15, 19, 13

    Answer: 15.666666666667

Wednesday 18 March 2026

Keystones #77 · Five questions · Open this day only

  1. 1. Number

    Calculate: 22 + 52

    Answer: 22 + 52 = 74
  2. 2. Algebra

    Factorise: 20x + 16

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

    Opposite = 10cm, adjacent = 11cm. Calculate the angle

    Answer: 42.3°
  4. 4. Ratio

    Simplify the ratio 4:14

    Answer: 2:7
  5. 5. Statistics

    Find the range of: 16, 22, 19, 5, 9

    Answer: 17

Thursday 19 March 2026

Keystones #78 · Five questions · Open this day only

  1. 1. Number

    Calculate: 434 + 899

    Answer: 434 + 899 = 1333
  2. 2. Algebra

    Collect like terms: 8x + 5y + 3x + 5y

    Answer: 11x + 10y
  3. 3. Geometry

    Opposite = 11cm, hypotenuse = 22cm. Find the angle

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

    Simplify the ratio 4:14

    Answer: 2:7
  5. 5. Statistics

    Calculate the mean of: 22, 11, 44, 36, 13, 39, 17, 8

    Answer: 23.8

Friday 20 March 2026

Keystones #79 · Five questions · Open this day only

  1. 1. Number

    Calculate: 34 + 57

    Answer: 34 + 57 = 91
  2. 2. Algebra

    Collect like terms: 5x + 8y + 2x + 8y

    Answer: 7x + 16y
  3. 3. Geometry

    Opposite = 11cm, adjacent = 16cm. Calculate the angle

    Answer: 34.5°
  4. 4. Ratio

    Simplify the ratio 9:15

    Answer: 3:5
  5. 5. Statistics

    Find the range of: 19, 42, 29, 38, 30

    Answer: 23