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Cornerstone Apr 2 - 8 25 questions
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Monday 30 March 2026

Keystones #89 · Five questions · Open this day only

  1. 1. Number

    Add: 56 + 35

    Answer: 4330
  2. 2. Algebra

    Expand: 6(x + 6)

    Answer: 6x + 36
  3. 3. Geometry

    Opposite = 8cm, adjacent = 16cm. Calculate the angle

    Answer: 26.6°
  4. 4. Ratio

    Simplify: 4:6:6

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

    Find the mean of: 16, 13, 15

    Answer: 14.666666666667

Tuesday 31 March 2026

Keystones #90 · Five questions · Open this day only

  1. 1. Number

    Calculate: 3.6 + 6.9

    Answer: 3.6 + 6.9 = 10.5
  2. 2. Algebra

    Factorise: 5x² + 6x

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

    Opposite = 12cm, hypotenuse = 17cm. Find the angle

    Answer: 45° (approximately)
  4. 4. Ratio

    Simplify: 6:6:15

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

    Calculate the mean of: 10, 24, 44, 32, 18, 9, 19

    Answer: 22.3

Wednesday 1 April 2026

Keystones #91 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 44 + ? = 112

    Answer: 68
  2. 2. Algebra

    Solve: 3x = 33

    Answer: x = 11
  3. 3. Geometry

    Opposite = 7cm, hypotenuse = 14cm. Find the angle

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

    Calculate 25% of 112

    Answer: 28
  5. 5. Statistics

    Calculate the mean of: 34, 29, 6, 36, 11, 31

    Answer: 24.5

Thursday 2 April 2026

Keystones #92 · Five questions · Open this day only

  1. 1. Number

    Calculate: 45 + 33

    Answer: 45 + 33 = 78
  2. 2. Algebra

    Collect like terms: 2x + 6y + 6x + 8y

    Answer: 8x + 14y
  3. 3. Geometry

    Opposite = 13cm, adjacent = 10cm. Calculate the angle

    Answer: 52.4°
  4. 4. Ratio

    Calculate 50% of 38

    Answer: 19
  5. 5. Statistics

    Calculate the mean of: 28, 34, 13, 12, 11, 49, 19, 38

    Answer: 25.5

Friday 3 April 2026

Keystones #93 · Five questions · Open this day only

  1. 1. Number

    Calculate: 846 + 451

    Answer: 846 + 451 = 1297
  2. 2. Algebra

    Simplify: 4x + 7x

    Answer: 11x
  3. 3. Geometry

    Opposite = 6cm, hypotenuse = 8.5cm. Find the angle

    Answer: 45° (approximately)
  4. 4. Ratio

    Simplify the ratio 25:10

    Answer: 5:2
  5. 5. Statistics

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

    Answer: 12