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Cornerstone Apr 20 - 26 25 questions
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Monday 20 April 2026

Keystones #110 · Five questions · Open this day only

  1. 1. Number

    Calculate: 3⁄12 × 6

    Answer: 3⁄2
  2. 2. Algebra

    Expand: 3(x + 3)

    Answer: 3x + 9
  3. 3. Geometry

    Find b if a = 10cm and c = 14cm

    Answer: 9.8cm
  4. 4. Ratio

    In ratio 3:2, the difference between shares is 28. What are the shares?

    Answer: 84 and 56
  5. 5. Statistics

    Calculate the range of: 62, 39, 57, 41, 24, 60

    Answer: 38

Tuesday 21 April 2026

Keystones #111 · Five questions · Open this day only

  1. 1. Number

    Multiply: 2⁄8 × 1⁄3

    Answer: 1⁄12
  2. 2. Algebra

    Expand: 2(6x + 3)

    Answer: 12x + 6
  3. 3. Geometry

    In a right triangle, if c = 10cm and a = 6cm, find b

    Answer: 8cm
  4. 4. Ratio

    In ratio 3:1, the difference between shares is 20. What are the shares?

    Answer: 30 and 10
  5. 5. Statistics

    Find the range of: 16, 29, 29, 21, 14

    Answer: 15

Wednesday 22 April 2026

Keystones #112 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄12 × 2

    Answer: 1⁄3
  2. 2. Algebra

    Expand: 6(5x + 9)

    Answer: 30x + 54
  3. 3. Geometry

    Find b if a = 11cm and c = 19cm

    Answer: 15.49cm
  4. 4. Ratio

    In ratio 6:1, the difference between shares is 145. What are the shares?

    Answer: 174 and 29
  5. 5. Statistics

    Find the range of: 17, 13, 20, 41, 24

    Answer: 28

Thursday 23 April 2026

Keystones #113 · Five questions · Open this day only

  1. 1. Number

    Multiply: 4⁄5 × 2⁄6

    Answer: 4⁄15
  2. 2. Algebra

    Expand: 6(x + 3)

    Answer: 6x + 18
  3. 3. Geometry

    Find b if a = 15cm and c = 25cm

    Answer: 20cm
  4. 4. Ratio

    In ratio 7:4, the difference between shares is 87. What are the shares?

    Answer: 203 and 116
  5. 5. Statistics

    Calculate the range of: 85, 55, 85, 32, 64, 41

    Answer: 53

Friday 24 April 2026

Keystones #114 · Five questions · Open this day only

  1. 1. Number

    Multiply: 4⁄6 × 5⁄4

    Answer: 5⁄6
  2. 2. Algebra

    Expand: 5(x + 4)

    Answer: 5x + 20
  3. 3. Geometry

    Find b if a = 12cm and c = 16cm

    Answer: 10.58cm
  4. 4. Ratio

    A and B share in ratio 5:2. If the difference is 75, what does A get?

    Answer: 125
  5. 5. Statistics

    Find the range of: 20, 14, 19, 16, 6

    Answer: 14