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Cornerstone Jan 29 - Feb 4 25 questions
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Monday 26 January 2026

Keystones #26 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 96 + ? = 149

    Answer: 53
  2. 2. Algebra

    Collect like terms: 3x + 6y + 6x + 2y

    Answer: 9x + 8y
  3. 3. Geometry

    Calculate the area of a circle with diameter 22cm

    Answer: 380.13cm²
  4. 4. Ratio

    Simplify: 12:12:24

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

    Find the range of: 22, 5, 9, 19, 15

    Answer: 17

Tuesday 27 January 2026

Keystones #27 · Five questions · Open this day only

  1. 1. Number

    Calculate: 55 + 99

    Answer: 55 + 99 = 154
  2. 2. Algebra

    Expand: 5(x + 7)

    Answer: 5x + 35
  3. 3. Geometry

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

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

    Find 26% of 436

    Answer: 113.36
  5. 5. Statistics

    Calculate the mean of: 10, 35, 9, 13, 32, 46, 45, 34

    Answer: 28

Wednesday 28 January 2026

Keystones #28 · Five questions · Open this day only

  1. 1. Number

    Calculate: 58 + 63

    Answer: 58 + 63 = 121
  2. 2. Algebra

    Factorise: 30x + 12

    Answer: 6(5x + 2)
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 8cm and 15cm

    Answer: 17cm
  4. 4. Ratio

    Find 62% of 305

    Answer: 189.1
  5. 5. Statistics

    Calculate the mean of: 11, 39, 12, 15, 9, 40, 19, 12

    Answer: 19.6

Thursday 29 January 2026

Keystones #29 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 66 + ? = 140

    Answer: 74
  2. 2. Algebra

    Collect like terms: 8x + 4y + 6x + 3y

    Answer: 14x + 7y
  3. 3. Geometry

    Calculate the hypotenuse when a = 10cm and b = 15cm

    Answer: 18.03cm
  4. 4. Ratio

    Simplify: 6:4:10

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

    Find the mean of: 17, 9, 8, 15, 11

    Answer: 12

Friday 30 January 2026

Keystones #30 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 44 + ? = 145

    Answer: 101
  2. 2. Algebra

    Solve: 9x = 27

    Answer: x = 3
  3. 3. Geometry

    Find the area of a circle with radius 3cm

    Answer: 28.27cm²
  4. 4. Ratio

    Simplify: 8:10:6

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

    Find the mean of: 10, 13, 20, 2

    Answer: 11.25