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Lintel Mar 12 - 18 25 questions
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Monday 16 March 2026

Keystones #75 · Five questions · Open this day only

  1. 1. Number

    Calculate: 957 + 708

    Answer: 957 + 708 = 1665
  2. 2. Algebra

    Solve: 5x = 35

    Answer: x = 7
  3. 3. Geometry

    Opposite = 10cm, adjacent = 11cm. Calculate the angle

    Answer: 42.3°
  4. 4. Ratio

    Calculate 13.4% of 384

    Answer: 51.46
  5. 5. Statistics

    Find the range of: 30, -19, -19, 49, 8

    Answer: 68

Tuesday 17 March 2026

Keystones #76 · Five questions · Open this day only

  1. 1. Number

    The sum of three consecutive numbers is 129. What are the numbers?

    Answer: 42, 43, and 44
  2. 2. Algebra

    Factorise fully: 25x² + 15x

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

    Adjacent = 20cm, hypotenuse = 37cm. Find the angle

    Answer: 57.3°
  4. 4. Ratio

    Simplify the ratio 4m:400cm

    Answer: 1:100
  5. 5. Statistics

    A bag has 7 red and 3 blue balls. What is the probability of picking a red ball?

    Answer: 7⁄10

Wednesday 18 March 2026

Keystones #77 · Five questions · Open this day only

  1. 1. Number

    Find the missing number: 8.67 + □ = 11.04

    Answer: □ = 2.37
  2. 2. Algebra

    Find the next term: 1, 2, 4, 7, ...

    Answer: 11
  3. 3. Geometry

    A circle has area 153.9cm². Find its radius (dp)

    Answer: 7cm
  4. 4. Ratio

    Simplify the ratio 5m:500cm

    Answer: 1:100
  5. 5. Statistics

    Calculate the mean of: 34, 28, 10, 40, 41, 49, 42

    Answer: 34.9

Thursday 19 March 2026

Keystones #78 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 50 + ? = 182

    Answer: 132
  2. 2. Algebra

    Factorise: 3x² + 2x

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

    Calculate the hypotenuse when a = 7cm and b = 14cm

    Answer: 15.65cm
  4. 4. Ratio

    Simplify the ratio 2m:200cm

    Answer: 1:100
  5. 5. Statistics

    A spinner has 3 red, 5 blue and 6 green sections. Probability of landing on red?

    Answer: 3⁄14

Friday 20 March 2026

Keystones #79 · Five questions · Open this day only

  1. 1. Number

    Calculate: 996 + 699

    Answer: 1695
  2. 2. Algebra

    Collect like terms: 6x + 5y + 7x + 8y

    Answer: 13x + 13y
  3. 3. Geometry

    Adjacent = 22cm, hypotenuse = 31cm. Find the angle

    Answer: 44.8°
  4. 4. Ratio

    Simplify the ratio 2m:200cm

    Answer: 1:100
  5. 5. Statistics

    Calculate the mean of: 27, 13, 44, 26, 11, 24

    Answer: 24.2