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Cornerstone Aug 6 - 12 25 questions
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Monday 3 August 2026

Keystones #49 · Five questions · Open this day only

  1. 1. Number

    Calculate: 16 + 26

    Answer: 12
  2. 2. Algebra

    Solve: x + 12 = 27

    Answer: x = 15
  3. 3. Geometry

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

    Answer: 45°
  4. 4. Ratio

    Simplify: 12:9:6

    Answer: 4:3:2
  5. 5. Statistics

    Find the mean of: 7, 19, 12, 19, 12

    Answer: 13.8

Tuesday 4 August 2026

Keystones #50 · Five questions · Open this day only

  1. 1. Number

    Calculate: 67 + 89

    Answer: 67 + 89 = 156
  2. 2. Algebra

    Solve: x + 12 = 20

    Answer: x = 8
  3. 3. Geometry

    Calculate the area of a circle with diameter 12cm

    Answer: 113.cm²
  4. 4. Ratio

    Simplify the ratio 10:14

    Answer: 5:7
  5. 5. Statistics

    A bag has 8 red and 4 blue balls. What is the probability of picking a red ball?

    Answer: 23

Wednesday 5 August 2026

Keystones #51 · Five questions · Open this day only

  1. 1. Number

    Calculate: 11 + (10) + (-11)

    Answer: 10
  2. 2. Algebra

    What is the next term? 8, 16, 32, 64, ...

    Answer: 128
  3. 3. Geometry

    Find the area of a circle with radius 4cm

    Answer: 50.27cm²
  4. 4. Ratio

    Calculate 25% of 141

    Answer: 35.25
  5. 5. Statistics

    Find the range of: 8, 13, 12, 17, 19

    Answer: 11

Thursday 6 August 2026

Keystones #52 · Five questions · Open this day only

  1. 1. Number

    Calculate: 510 + 410

    Answer: 910
  2. 2. Algebra

    What is the next term? 8, 24, 72, 216, ...

    Answer: 648
  3. 3. Geometry

    Calculate the area of a circle with diameter 21cm

    Answer: 346.36cm²
  4. 4. Ratio

    Simplify the ratio 24:8

    Answer: 3:1
  5. 5. Statistics

    Find the range of: 25, 17, 13, 10, 37

    Answer: 27

Friday 7 August 2026

Keystones #53 · Five questions · Open this day only

  1. 1. Number

    Find the total of 160, 275, and 141

    Answer: 576
  2. 2. Algebra

    Factorise: 15x + 15

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

    Opposite = 10cm, hypotenuse = 20cm. Find the angle

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

    Simplify the ratio 14:10

    Answer: 7:5
  5. 5. Statistics

    A bag has 8 red and 7 blue balls. What is the probability of picking a red ball?

    Answer: 815