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Cornerstone Jan 1 - 7 25 questions
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Monday 13 December 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 26 + 40

    Answer: 26 + 40 = 66
  2. 2. Algebra

    Simplify: 6x + 6x

    Answer: 12x
  3. 3. Geometry

    Calculate the area of a circle with diameter 17cm

    Answer: 226.98cm²
  4. 4. Ratio

    Simplify the ratio 25:20

    Answer: 5:4
  5. 5. Statistics

    Calculate the range of: 100, 20, 36, 78, 82, 96

    Answer: 80

Tuesday 14 December 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 810 + 110

    Answer: 910
  2. 2. Algebra

    Expand: 3(x + 8)

    Answer: 3x + 24
  3. 3. Geometry

    Calculate the area of a circle with diameter 21cm

    Answer: 346.36cm²
  4. 4. Ratio

    Simplify: 10:6:6

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

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

    Answer: 12

Wednesday 15 December 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 231 + 612

    Answer: 231 + 612 = 843
  2. 2. Algebra

    Solve: 4x = 24

    Answer: x = 6
  3. 3. Geometry

    Find the area of a circle with radius 4cm

    Answer: 50.27cm²
  4. 4. Ratio

    Find 55% of 253

    Answer: 139.15
  5. 5. Statistics

    Calculate the range of: 53, 47, 88, 95, 36, 92

    Answer: 59

Thursday 16 December 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 87 + 30

    Answer: 87 + 30 = 117
  2. 2. Algebra

    Solve: 5x = 30

    Answer: x = 6
  3. 3. Geometry

    Calculate the area of a circle with diameter 17cm

    Answer: 226.98cm²
  4. 4. Ratio

    Simplify: 4:10:8

    Answer: 2:5:4
  5. 5. Statistics

    Calculate the mean of: 26, 21, 39, 49, 26, 6, 43

    Answer: 30

Friday 17 December 2021

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 45 + ? = 111

    Answer: 66
  2. 2. Algebra

    Solve: x + 15 = 27

    Answer: x = 12
  3. 3. Geometry

    Opposite = 12cm, hypotenuse = 13.9cm. Find the angle

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

    Simplify: 8:20:12

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

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

    Answer: 12