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Lintel Mar 26 - Apr 1 25 questions
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Monday 23 March 2026

Keystones #82 · Five questions · Open this day only

  1. 1. Number

    Calculate: 535 + 515

    Answer: 535 + 515 = 1050
  2. 2. Algebra

    Collect like terms: 7x + 6y + 3x + 4y

    Answer: 10x + 10y
  3. 3. Geometry

    Calculate the hypotenuse when a = 11cm and b = 4cm

    Answer: 11.7cm
  4. 4. Ratio

    Simplify the ratio 6m:600cm

    Answer: 1:100
  5. 5. Statistics

    Calculate the mean of: 22, 39, 17, 13, 15, 28

    Answer: 22.3

Tuesday 24 March 2026

Keystones #83 · Five questions · Open this day only

  1. 1. Number

    Calculate: 405 + 716

    Answer: 405 + 716 = 1121
  2. 2. Algebra

    Factorise: 7x² + 4x

    Answer: x(7x + 4)
  3. 3. Geometry

    Calculate the distance between (1, 7) and (4, 11)

    Answer: 5
  4. 4. Ratio

    Simplify: 10:6:6

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

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

    Answer: 2⁄7

Wednesday 25 March 2026

Keystones #84 · Five questions · Open this day only

  1. 1. Number

    The sum of three consecutive numbers is 141. What are the numbers?

    Answer: 46, 47, and 48
  2. 2. Algebra

    Factorise fully: 6x² + 6x

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

    Adjacent = 21cm, hypotenuse = 29cm. Find the angle

    Answer: 43.6°
  4. 4. Ratio

    Simplify: 10:6:10

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

    Calculate the mean of: 33, 31, 20, 18, 11, 7, 7, 18

    Answer: 18.1

Thursday 26 March 2026

Keystones #85 · Five questions · Open this day only

  1. 1. Number

    Calculate: 661 + 527

    Answer: 661 + 527 = 1188
  2. 2. Algebra

    Solve: x⁄4 = 4.25

    Answer: x = 17
  3. 3. Geometry

    Opposite = 8cm, adjacent = 18cm. Calculate the angle

    Answer: 24°
  4. 4. Ratio

    Simplify: 12:12:16

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

    Calculate the mean of: 5, 20, 44, 47, 6, 15

    Answer: 22.8

Friday 27 March 2026

Keystones #86 · Five questions · Open this day only

  1. 1. Number

    Calculate: 994 + 705

    Answer: 1699
  2. 2. Algebra

    Solve: 2x = 14

    Answer: x = 7
  3. 3. Geometry

    A right triangle has hypotenuse 17cm and one side 8cm. Find its area

    Answer: 60cm²
  4. 4. Ratio

    Simplify: 20:24:16

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

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

    Answer: 1⁄4