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Cornerstone Jan 12 - 18 25 questions
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Monday 12 January 2026

Keystones #12 · Five questions · Open this day only

  1. 1. Number

    Multiply: 2⁄3 × 2⁄7

    Answer: 4⁄21
  2. 2. Algebra

    Expand: 7(x + 9)

    Answer: 7x + 63
  3. 3. Geometry

    In a right triangle, if c = 5cm and a = 3cm, find b

    Answer: 4cm
  4. 4. Ratio

    A and B share in ratio 5:4. If the difference is 39, what does A get?

    Answer: 195
  5. 5. Statistics

    Find the range of: 13, 24, 24, 13, 13

    Answer: 11

Tuesday 13 January 2026

Keystones #13 · Five questions · Open this day only

  1. 1. Number

    Calculate: 4⁄8 × 8

    Answer: 4
  2. 2. Algebra

    Expand: 4(3x + 6)

    Answer: 12x + 24
  3. 3. Geometry

    Find b if a = 9cm and c = 15cm

    Answer: 12cm
  4. 4. Ratio

    A and B share in ratio 7:2. If the difference is 200, what does A get?

    Answer: 280
  5. 5. Statistics

    Calculate the range of: 41, 61, 58, 41, 85, 92

    Answer: 51

Wednesday 14 January 2026

Keystones #14 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄4 × 4

    Answer: 2
  2. 2. Algebra

    Expand: 4(2x + 8)

    Answer: 8x + 32
  3. 3. Geometry

    In a right triangle, if c = 13cm and a = 5cm, find b

    Answer: 12cm
  4. 4. Ratio

    In ratio 5:1, the difference between shares is 104. What are the shares?

    Answer: 130 and 26
  5. 5. Statistics

    Find the range of: 38, 17, 8, 29, 16

    Answer: 30

Thursday 15 January 2026

Keystones #15 · Five questions · Open this day only

  1. 1. Number

    Multiply: 4⁄5 × 5⁄5

    Answer: 4⁄5
  2. 2. Algebra

    Expand: 3(x + 2)

    Answer: 3x + 6
  3. 3. Geometry

    Find b if a = 12cm and c = 22cm

    Answer: 18.44cm
  4. 4. Ratio

    In ratio 4:3, the difference between shares is 11. What are the shares?

    Answer: 44 and 33
  5. 5. Statistics

    Calculate the range of: 49, 59, 38, 57, 45, 80

    Answer: 42

Friday 16 January 2026

Keystones #16 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄12 × 6

    Answer: 1
  2. 2. Algebra

    Expand: 2(x + 9)

    Answer: 2x + 18
  3. 3. Geometry

    Find b if a = 14cm and c = 19cm

    Answer: 12.85cm
  4. 4. Ratio

    In ratio 3:2, the difference between shares is 27. What are the shares?

    Answer: 81 and 54
  5. 5. Statistics

    Calculate the range of: 59, 88, 37, 110, 112, 32

    Answer: 80