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Cornerstone May 7 - 13 25 questions
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Monday 4 May 2026

Keystones #124 · Five questions · Open this day only

  1. 1. Number

    Add: 3⁄4 + 4⁄5

    Answer: 31⁄20
  2. 2. Algebra

    Solve: 2x = 6

    Answer: x = 3
  3. 3. Geometry

    Find the area of a right triangle with base 7cm and height 8cm

    Answer: 28cm²
  4. 4. Ratio

    Simplify the ratio 4:8

    Answer: 1:2
  5. 5. Statistics

    Calculate the range of: 123, 64, 50, 104, 117, 116

    Answer: 73

Tuesday 5 May 2026

Keystones #125 · Five questions · Open this day only

  1. 1. Number

    Calculate: 33 + 86

    Answer: 33 + 86 = 119
  2. 2. Algebra

    Solve: x + 14 = 26

    Answer: x = 12
  3. 3. Geometry

    Calculate the perimeter of a right triangle with sides 8cm and 12cm

    Answer: 34.4cm
  4. 4. Ratio

    Simplify the ratio 4:12

    Answer: 1:3
  5. 5. Statistics

    What is the probability of getting heads when flipping a fair coin?

    Answer: 1⁄2

Wednesday 6 May 2026

Keystones #126 · Five questions · Open this day only

  1. 1. Number

    Calculate: 986 + 350

    Answer: 986 + 350 = 1336
  2. 2. Algebra

    Solve: x + 13 = 24

    Answer: x = 11
  3. 3. Geometry

    Find the distance between (4, 5) and (7, 10)

    Answer: 5.83
  4. 4. Ratio

    Simplify the ratio 15:20

    Answer: 3:4
  5. 5. Statistics

    Find the range of: 35, 16, 28, 33, 32

    Answer: 19

Thursday 7 May 2026

Keystones #127 · Five questions · Open this day only

  1. 1. Number

    Calculate: 68 + 47

    Answer: 68 + 47 = 115
  2. 2. Algebra

    Expand: 5(5x + 9)

    Answer: 25x + 45
  3. 3. Geometry

    Calculate perimeter: two sides are 6cm and 14cm at right angles

    Answer: 35.2cm
  4. 4. Ratio

    Simplify the ratio 15:40

    Answer: 3:8
  5. 5. Statistics

    Calculate the range of: 92, 43, 73, 92, 89, 46

    Answer: 49

Friday 8 May 2026

Keystones #128 · Five questions · Open this day only

  1. 1. Number

    Calculate: 72 + 40

    Answer: 72 + 40 = 112
  2. 2. Algebra

    Solve: 5x = 75

    Answer: x = 15
  3. 3. Geometry

    Calculate the area of a circle with diameter 15cm

    Answer: 176.71cm²
  4. 4. Ratio

    Simplify the ratio 16:8

    Answer: 2:1
  5. 5. Statistics

    Calculate the mean of: 18, 40, 46, 48, 34, 31, 16

    Answer: 33.3