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Cornerstone Oct 12 - 18 25 questions
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Monday 12 October 2026

Keystones #285 · Five questions · Open this day only

  1. 1. Number

    Divide: 1⁄7 ÷ 3⁄4

    Answer: 4⁄21
  2. 2. Algebra

    Solve: 2x - 5 > 29

    Answer: x > 17
  3. 3. Geometry

    Find the area of a right triangle with base 9cm and height 12cm

    Answer: 54cm²
  4. 4. Ratio

    9 kg costs £33.20. What is the cost of 25 kg?

    Answer: £92.22
  5. 5. Statistics

    What are the modes of: 12, 12, 20, 32, 32, 29

    Answer: 12 and 32

Tuesday 13 October 2026

Keystones #286 · Five questions · Open this day only

  1. 1. Number

    Calculate: 1⁄8 ÷ 5

    Answer: 1⁄40
  2. 2. Algebra

    Solve: 4x + 6 < 46

    Answer: x < 10
  3. 3. Geometry

    Calculate the area of a right triangle with perpendicular sides 15cm and 9cm

    Answer: 67.5cm²
  4. 4. Ratio

    7 kg costs £43.90. What is the cost of 14 kg?

    Answer: £87.80
  5. 5. Statistics

    Find the mode of: 10, 14, 9, 14, 14, 7

    Answer: 14

Wednesday 14 October 2026

Keystones #287 · Five questions · Open this day only

  1. 1. Number

    Calculate: 6⁄4 ÷ 3

    Answer: 1⁄2
  2. 2. Algebra

    Solve: 2x + 3 < 26

    Answer: x < 11.5
  3. 3. Geometry

    Calculate the area of a right triangle with perpendicular sides 11cm and 7cm

    Answer: 38.5cm²
  4. 4. Ratio

    If 8 items cost £48.00, how much do 15 items cost?

    Answer: £90.00
  5. 5. Statistics

    What are the modes of: 19, 37, 11, 28, 11, 37

    Answer: 11 and 37

Thursday 15 October 2026

Keystones #288 · Five questions · Open this day only

  1. 1. Number

    Divide: 5⁄3 ÷ 4⁄6

    Answer: 5⁄2
  2. 2. Algebra

    Solve: 7x - 15 > 10

    Answer: x > 3.6
  3. 3. Geometry

    Find the area of a right triangle with base 8cm and height 6cm

    Answer: 24cm²
  4. 4. Ratio

    If 6 items cost £18.00, how much do 7 items cost?

    Answer: £21.00
  5. 5. Statistics

    Find the mode of: 9, 15, 15, 9, 6, 15

    Answer: 15

Friday 16 October 2026

Keystones #289 · Five questions · Open this day only

  1. 1. Number

    Calculate: 6⁄2 ÷ 5

    Answer: 3⁄5
  2. 2. Algebra

    Solve: 6x - 14 > 11

    Answer: x > 4.2
  3. 3. Geometry

    Calculate the area of a right triangle with perpendicular sides 8cm and 13cm

    Answer: 52cm²
  4. 4. Ratio

    If 3 items cost £24.00, how much do 5 items cost?

    Answer: £40.00
  5. 5. Statistics

    Find the mode of: 8, 12, 15, 15, 15, 6

    Answer: 15