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Cornerstone Feb 26 - Mar 4 25 questions
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Monday 2 March 2026

Keystones #61 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 94 + ? = 128

    Answer: 34
  2. 2. Algebra

    Find the next term: 30, 40, 50, 60, ...

    Answer: 70
  3. 3. Geometry

    Opposite = 14cm, adjacent = 8cm. Calculate the angle

    Answer: 60.3°
  4. 4. Ratio

    Simplify the ratio 18:9

    Answer: 2:1
  5. 5. Statistics

    Find the mean of: 19, 6, 5, 7

    Answer: 9.25

Tuesday 3 March 2026

Keystones #62 · Five questions · Open this day only

  1. 1. Number

    Calculate: 80 + 45

    Answer: 80 + 45 = 125
  2. 2. Algebra

    Solve: 7x = 63

    Answer: x = 9
  3. 3. Geometry

    Opposite = 9cm, hypotenuse = 18cm. Find the angle

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

    Simplify the ratio 21:9

    Answer: 7:3
  5. 5. Statistics

    Calculate the range of: 39, 59, 55, 55, 71, 51

    Answer: 32

Wednesday 4 March 2026

Keystones #63 · Five questions · Open this day only

  1. 1. Number

    Calculate: 40 + 28

    Answer: 40 + 28 = 68
  2. 2. Algebra

    What is the next term? 8, 24, 72, 216, ...

    Answer: 648
  3. 3. Geometry

    Find the perimeter of a right triangle with sides 5cm, 12cm, 13cm

    Answer: 30cm
  4. 4. Ratio

    Simplify: 6:9:12

    Answer: 2:3:4
  5. 5. Statistics

    Find the mean of: 6, 15, 8, 4, 16

    Answer: 9.8

Thursday 5 March 2026

Keystones #64 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 80 + ? = 116

    Answer: 36
  2. 2. Algebra

    Simplify: 7x + 3x

    Answer: 10x
  3. 3. Geometry

    Calculate perimeter: two sides are 6cm and 15cm at right angles

    Answer: 37.2cm
  4. 4. Ratio

    Simplify: 12:20:24

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

    Calculate the mean of: 40, 40, 7, 40, 9, 5, 22, 26

    Answer: 23.6

Friday 6 March 2026

Keystones #65 · Five questions · Open this day only

  1. 1. Number

    Calculate: 82 + 62

    Answer: 82 + 62 = 144
  2. 2. Algebra

    Factorise: 4x + 12

    Answer: 2(2x + 6)
  3. 3. Geometry

    Find the area of a circle with radius 4cm

    Answer: 50.27cm²
  4. 4. Ratio

    Find 67% of 288

    Answer: 192.96
  5. 5. Statistics

    Calculate the mean of: 11, 11, 46, 43, 35, 33, 46

    Answer: 32.1