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Lintel Apr 16 - 22 25 questions
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Monday 20 April 2026

Keystones #110 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 37 + ? = 101

    Answer: 64
  2. 2. Algebra

    Solve: x⁄3 = 10

    Answer: x = 30
  3. 3. Geometry

    Adjacent = 13cm, hypotenuse = 33cm. Find the angle

    Answer: 66.8°
  4. 4. Ratio

    Calculate 33.1% of 717

    Answer: 237.33
  5. 5. Statistics

    Find the range of: 48, 7, 32, 23, -29

    Answer: 77

Tuesday 21 April 2026

Keystones #111 · Five questions · Open this day only

  1. 1. Number

    Calculate: 994 + 642

    Answer: 1636
  2. 2. Algebra

    Factorise: 4x² + 4x

    Answer: 4x(x + 1)
  3. 3. Geometry

    Opposite = 12cm, adjacent = 13cm. Calculate the angle

    Answer: 42.7°
  4. 4. Ratio

    Simplify the ratio 6m:600cm

    Answer: 1:100
  5. 5. Statistics

    A bag has 6 red and 7 blue balls. What is the probability of picking a red ball?

    Answer: 6⁄13

Wednesday 22 April 2026

Keystones #112 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 55 + ? = 125

    Answer: 70
  2. 2. Algebra

    Solve: 2x = 28

    Answer: x = 14
  3. 3. Geometry

    Find c if a = 20cm and b = 18cm in a right triangle

    Answer: 26.9cm
  4. 4. Ratio

    Simplify the ratio 7m:700cm

    Answer: 1:100
  5. 5. Statistics

    A bag has 6 red and 6 blue balls. What is the probability of picking a red ball?

    Answer: 1⁄2

Thursday 23 April 2026

Keystones #113 · Five questions · Open this day only

  1. 1. Number

    Calculate: 990 + 756

    Answer: 1746
  2. 2. Algebra

    Factorise fully: 24x² + 8x

    Answer: 4x(6x + 2)
  3. 3. Geometry

    Opposite = 12cm, adjacent = 18cm. Calculate the angle

    Answer: 33.7°
  4. 4. Ratio

    Calculate 35.3% of 202

    Answer: 71.31
  5. 5. Statistics

    Find the range of: -30, -1, 21, 33, -26

    Answer: 63

Friday 24 April 2026

Keystones #114 · Five questions · Open this day only

  1. 1. Number

    Calculate: 4⁄6 + 1⁄4 + 2⁄3

    Answer: 19⁄12
  2. 2. Algebra

    Solve: x⁄4 = 3.25

    Answer: x = 13
  3. 3. Geometry

    Calculate the area of a circle with diameter 8cm

    Answer: 50.27cm²
  4. 4. Ratio

    Simplify: 12:8:6

    Answer: 6:4:3
  5. 5. Statistics

    A bag has 6 red and 7 blue balls. What is the probability of picking a red ball?

    Answer: 6⁄13