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Lintel Jul 23 - 29 25 questions
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Monday 20 July 2026

Keystones #35 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 78 + ? = 175

    Answer: 97
  2. 2. Algebra

    Factorise fully: 16x² + 12x

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

    Opposite = 18cm, adjacent = 15cm. Calculate the angle

    Answer: 50.2°
  4. 4. Ratio

    Find 64% of 198

    Answer: 126.72
  5. 5. Statistics

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

    Answer: 2⁄5

Tuesday 21 July 2026

Keystones #36 · Five questions · Open this day only

  1. 1. Number

    Calculate: 995 + 624

    Answer: 1619
  2. 2. Algebra

    What is the next term? 7, 14, 28, 56, ...

    Answer: 112
  3. 3. Geometry

    Adjacent = 22cm, hypotenuse = 30cm. Find the angle

    Answer: 42.8°
  4. 4. Ratio

    Simplify: 20:24:16

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

    Calculate the mean of: 11, 23, 12, 34, 34, 35, 41

    Answer: 27.1

Wednesday 22 July 2026

Keystones #37 · Five questions · Open this day only

  1. 1. Number

    Calculate: 245 + 439

    Answer: 245 + 439 = 684
  2. 2. Algebra

    Collect like terms: 5x + 3y + 2x + 4y

    Answer: 7x + 7y
  3. 3. Geometry

    Opposite = 18cm, adjacent = 20cm. Calculate the angle

    Answer: 42°
  4. 4. Ratio

    Simplify: 6:10:8

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

    Calculate the mean of: 17, 36, 42, 10, 21, 15, 24, 30

    Answer: 24.4

Thursday 23 July 2026

Keystones #38 · Five questions · Open this day only

  1. 1. Number

    Calculate: 999 + 881

    Answer: 1880
  2. 2. Algebra

    Solve: x⁄8 = 4.875

    Answer: x = 39
  3. 3. Geometry

    A circle has area 380.cm². Find its radius (dp)

    Answer: 11cm
  4. 4. Ratio

    Simplify: 24:12:12

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

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

    Answer: 5⁄17

Friday 24 July 2026

Keystones #39 · Five questions · Open this day only

  1. 1. Number

    Calculate: 997 + 637

    Answer: 1634
  2. 2. Algebra

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

    Answer: 11
  3. 3. Geometry

    Find the distance between (0, 2) and (4, 5)

    Answer: 5
  4. 4. Ratio

    Calculate 33.5% of 607

    Answer: 203.35
  5. 5. Statistics

    Calculate the mean of: 26, 24, 31, 45, 24, 46, 5

    Answer: 28.7