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Cornerstone Jan 1 - 7 25 questions
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Monday 13 February 2023

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 71 + ? = 122

    Answer: 51
  2. 2. Algebra

    Simplify: 9x + 3x

    Answer: 12x
  3. 3. Geometry

    Calculate the area of a circle with diameter 24cm

    Answer: 452.39cm²
  4. 4. Ratio

    Simplify: 16:16:24

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

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

    Answer: 1⁄2

Tuesday 14 February 2023

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 12 + (46)

    Answer: 58
  2. 2. Algebra

    Solve: x + 8 = 28

    Answer: x = 20
  3. 3. Geometry

    Calculate the hypotenuse when a = 6cm and b = 13cm

    Answer: 14.32cm
  4. 4. Ratio

    Simplify the ratio 18:9

    Answer: 2:1
  5. 5. Statistics

    Calculate the mean of: 36, 23, 11, 38, 36, 42, 13, 40

    Answer: 29.9

Wednesday 15 February 2023

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 56 + 85

    Answer: 56 + 85 = 141
  2. 2. Algebra

    Solve: 9x = 54

    Answer: x = 6
  3. 3. Geometry

    Opposite = 11cm, hypotenuse = 12.7cm. Find the angle

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

    Calculate 25% of 82

    Answer: 20.5
  5. 5. Statistics

    Find the mean of: 2, 10, 15

    Answer: 9

Thursday 16 February 2023

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 666 + 144

    Answer: 666 + 144 = 810
  2. 2. Algebra

    Collect like terms: 8x + 3y + 8x + 7y

    Answer: 16x + 10y
  3. 3. Geometry

    Calculate the area of a circle with diameter 18cm

    Answer: 254.47cm²
  4. 4. Ratio

    Simplify the ratio 30:25

    Answer: 6:5
  5. 5. Statistics

    Find the range of: 26, 27, 10, 30, 28

    Answer: 20

Friday 17 February 2023

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 61 + 47

    Answer: 61 + 47 = 108
  2. 2. Algebra

    Factorise: 30x + 12

    Answer: 6(5x + 2)
  3. 3. Geometry

    Find the perimeter of a right triangle with sides 3cm and 4cm

    Answer: 12cm
  4. 4. Ratio

    Simplify the ratio 20:24

    Answer: 5:6
  5. 5. Statistics

    Calculate the mean of: 25, 10, 33, 49, 6, 35

    Answer: 26.3