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Cornerstone Jan 1 - 7 25 questions
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Monday 3 February 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Add: 57 + 13

    Answer: 2221
  2. 2. Algebra

    Solve: x + 2 = 19

    Answer: x = 17
  3. 3. Geometry

    Calculate the area of a circle with diameter 15cm

    Answer: 176.71cm²
  4. 4. Ratio

    Calculate 25% of 107

    Answer: 26.75
  5. 5. Statistics

    Find the range of: 13, 22, 9, 24, 16

    Answer: 15

Tuesday 4 February 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 41 + ? = 112

    Answer: 71
  2. 2. Algebra

    Solve: x + 7 = 22

    Answer: x = 15
  3. 3. Geometry

    Calculate the area of a circle with diameter 19cm

    Answer: 283.53cm²
  4. 4. Ratio

    Simplify: 12:24:24

    Answer: 1:2:2
  5. 5. Statistics

    Calculate the range of: 92, 118, 49, 98, 39, 68

    Answer: 79

Wednesday 5 February 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 87 + 25

    Answer: 87 + 25 = 112
  2. 2. Algebra

    Solve: 9x = 54

    Answer: x = 6
  3. 3. Geometry

    Find the area of a circle with radius 8cm

    Answer: 201.06cm²
  4. 4. Ratio

    Simplify: 12:6:6

    Answer: 2:1:1
  5. 5. Statistics

    Find the mean of: 3, 11, 3, 17

    Answer: 8.5

Thursday 6 February 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 82 + ? = 127

    Answer: 45
  2. 2. Algebra

    Solve: 7x = 21

    Answer: x = 3
  3. 3. Geometry

    Opposite = 14cm, adjacent = 17cm. Calculate the angle

    Answer: 39.5°
  4. 4. Ratio

    Simplify: 16:24:8

    Answer: 2:3:1
  5. 5. Statistics

    Find the mean of: 15, 9, 17

    Answer: 13.666666666667

Friday 7 February 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    Calculate: 53 + 70

    Answer: 53 + 70 = 123
  2. 2. Algebra

    Solve: x + 11 = 22

    Answer: x = 11
  3. 3. Geometry

    Opposite = 5cm, hypotenuse = 7.cm. Find the angle

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

    Find 52% of 500

    Answer: 260
  5. 5. Statistics

    A bag has 7 red and 4 blue balls. What is the probability of picking a red ball?

    Answer: 711