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Cornerstone Jul 16 - 22 25 questions
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Monday 20 July 2026

Keystones #35 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 66 + ? = 186

    Answer: 120
  2. 2. Algebra

    Expand: 2(x + 2)

    Answer: 2x + 4
  3. 3. Geometry

    Opposite = 14cm, hypotenuse = 16.2cm. Find the angle

    Answer: 60° (approximately)
  4. 4. Ratio

    Simplify: 9:12:18

    Answer: 3:4:6
  5. 5. Statistics

    Calculate the range of: 44, 28, 66, 51, 57, 38

    Answer: 38

Tuesday 21 July 2026

Keystones #36 · Five questions · Open this day only

  1. 1. Number

    Calculate: 69 + 60

    Answer: 69 + 60 = 129
  2. 2. Algebra

    Solve: 2x = 30

    Answer: x = 15
  3. 3. Geometry

    Opposite = 12cm, adjacent = 19cm. Calculate the angle

    Answer: 32.3°
  4. 4. Ratio

    Find 64% of 287

    Answer: 183.68
  5. 5. Statistics

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

    Answer: 1⁄2

Wednesday 22 July 2026

Keystones #37 · Five questions · Open this day only

  1. 1. Number

    Calculate: 329 + 431

    Answer: 329 + 431 = 760
  2. 2. Algebra

    Collect like terms: 6x + 3y + 5x + 7y

    Answer: 11x + 10y
  3. 3. Geometry

    Find the area of a circle with radius 3cm

    Answer: 28.27cm²
  4. 4. Ratio

    Simplify: 20:8:20

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

    Find the mean of: 5, 7, 3, 4, 16

    Answer: 7

Thursday 23 July 2026

Keystones #38 · Five questions · Open this day only

  1. 1. Number

    Calculate: 79 + 45

    Answer: 79 + 45 = 124
  2. 2. Algebra

    Simplify: 7x + 7x

    Answer: 14x
  3. 3. Geometry

    Calculate the area of a circle with diameter 24cm

    Answer: 452.39cm²
  4. 4. Ratio

    Find 57% of 370

    Answer: 210.9
  5. 5. Statistics

    Calculate the mean of: 11, 16, 40, 12, 7, 8

    Answer: 15.7

Friday 24 July 2026

Keystones #39 · Five questions · Open this day only

  1. 1. Number

    Calculate: 71 + 40

    Answer: 71 + 40 = 111
  2. 2. Algebra

    Expand: 4(x + 7)

    Answer: 4x + 28
  3. 3. Geometry

    Calculate the area of a circle with diameter 21cm

    Answer: 346.36cm²
  4. 4. Ratio

    Simplify the ratio 30:15

    Answer: 2:1
  5. 5. Statistics

    Find the range of: 11, 21, 14, 18, 25

    Answer: 14