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Lintel Aug 13 - 19 25 questions
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Monday 10 August 2026

Keystones #56 · Five questions · Open this day only

  1. 1. Number

    0.00074

    Answer: 7.4 × 10^-4
  2. 2. Algebra

    Solve: 2x = 26

    Answer: x = 13
  3. 3. Geometry

    Calculate the area of a right triangle with perpendicular sides 8cm and 9cm

    Answer: 36cm²
  4. 4. Ratio

    Simplify the ratio 3m:300cm

    Answer: 1:100
  5. 5. Statistics

    Calculate the mean of: 44, 24, 23, 45, 34, 15, 20, 16

    Answer: 27.6

Tuesday 11 August 2026

Keystones #57 · Five questions · Open this day only

  1. 1. Number

    Find the total of 159, 167, and 143

    Answer: 469
  2. 2. Algebra

    Simplify: 10x - 4x + 5y - 4y

    Answer: 6x + y
  3. 3. Geometry

    Adjacent = 22cm, hypotenuse = 42cm. Find the angle

    Answer: 58.4°
  4. 4. Ratio

    Calculate 45.1% of 992

    Answer: 447.39
  5. 5. Statistics

    A spinner has 5 red, 2 blue and 3 green sections. Probability of landing on red?

    Answer: 1⁄2

Wednesday 12 August 2026

Keystones #58 · Five questions · Open this day only

  1. 1. Number

    Calculate: 999 + 633

    Answer: 1632
  2. 2. Algebra

    Solve: x⁄5 = 5

    Answer: x = 25
  3. 3. Geometry

    Calculate the area of a circle with diameter 17cm

    Answer: 226.98cm²
  4. 4. Ratio

    Calculate 28.5% of 534

    Answer: 152.19
  5. 5. Statistics

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

    Answer: 1⁄2

Thursday 13 August 2026

Keystones #59 · Five questions · Open this day only

  1. 1. Number

    Calculate: 643 + 784

    Answer: 643 + 784 = 1427
  2. 2. Algebra

    What is the next term? 6, 24, 96, 384, ...

    Answer: 1536
  3. 3. Geometry

    Find c if a = 9cm and b = 13cm in a right triangle

    Answer: 15.8cm
  4. 4. Ratio

    Calculate 25.6% of 354

    Answer: 90.62
  5. 5. Statistics

    Calculate the mean of: 23, 11, 47, 19, 10, 18

    Answer: 21.3

Friday 14 August 2026

Keystones #60 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 32 + ? = 122

    Answer: 90
  2. 2. Algebra

    Solve: 4x = 56

    Answer: x = 14
  3. 3. Geometry

    Find the perimeter: hypotenuse = 20cm, one side = 11cm

    Answer: 47.7cm
  4. 4. Ratio

    Simplify: 8:8:12

    Answer: 2:2:3
  5. 5. Statistics

    A spinner has 5 red, 2 blue and 6 green sections. Probability of landing on red?

    Answer: 5⁄13