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Lintel Jun 18 - 24 25 questions
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Monday 22 June 2026

Keystones #7 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 91 + ? = 190

    Answer: 99
  2. 2. Algebra

    Solve: x⁄3 = 10

    Answer: x = 30
  3. 3. Geometry

    Opposite = 14cm, adjacent = 20cm. Calculate the angle

    Answer: 35°
  4. 4. Ratio

    Simplify the ratio 7m:700cm

    Answer: 1:100
  5. 5. Statistics

    Calculate the mean of: 5, 30, 31, 49, 50, 21, 34, 34

    Answer: 31.8

Tuesday 23 June 2026

Keystones #8 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2⁄4 + 2⁄5 + 2⁄4

    Answer: 7⁄5
  2. 2. Algebra

    Solve: 2x = 18

    Answer: x = 9
  3. 3. Geometry

    Adjacent = 18cm, hypotenuse = 34cm. Find the angle

    Answer: 58°
  4. 4. Ratio

    Simplify the ratio 7m:700cm

    Answer: 1:100
  5. 5. Statistics

    A spinner has 4 red, 2 blue and 6 green sections. Probability of landing on red?

    Answer: 1⁄3

Wednesday 24 June 2026

Keystones #9 · Five questions · Open this day only

  1. 1. Number

    Calculate: 5⁄6 + 5⁄6 + 2⁄6

    Answer: 2⁄1
  2. 2. Algebra

    Solve: 5x = 60

    Answer: x = 12
  3. 3. Geometry

    A circle has area 314.2cm². Find its radius (dp)

    Answer: 10cm
  4. 4. Ratio

    Simplify: 4:8:4

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

    Calculate the mean of: 31, 19, 41, 31, 34, 19, 49, 23

    Answer: 30.9

Thursday 25 June 2026

Keystones #10 · Five questions · Open this day only

  1. 1. Number

    Calculate: 352 + 415

    Answer: 352 + 415 = 767
  2. 2. Algebra

    For y = 3x³ + 12, find y when x = 3

    Answer: y = 93
  3. 3. Geometry

    Calculate the area of a right triangle with perpendicular sides 12cm and 13cm

    Answer: 78cm²
  4. 4. Ratio

    Find 33% of 314

    Answer: 103.62
  5. 5. Statistics

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

    Answer: 2⁄5

Friday 26 June 2026

Keystones #11 · Five questions · Open this day only

  1. 1. Number

    Calculate: (-30) + (-10) + (-6)

    Answer: -46
  2. 2. Algebra

    Solve: x⁄3 = 13

    Answer: x = 39
  3. 3. Geometry

    Adjacent = 29cm, hypotenuse = 43cm. Find the angle

    Answer: 47.6°
  4. 4. Ratio

    Find 57% of 259

    Answer: 147.63
  5. 5. Statistics

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

    Answer: 1⁄3