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Lintel Feb 26 - Mar 4 25 questions
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Monday 23 February 2026

Keystones #54 · Five questions · Open this day only

  1. 1. Number

    Calculate: 333 + 255

    Answer: 333 + 255 = 588
  2. 2. Algebra

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

    Answer: 11
  3. 3. Geometry

    Opposite = 17cm, adjacent = 11cm. Calculate the angle

    Answer: 57.1°
  4. 4. Ratio

    Find 80% of 150

    Answer: 120
  5. 5. Statistics

    Calculate the mean of: 45, 26, 17, 8, 45, 28

    Answer: 28.2

Tuesday 24 February 2026

Keystones #55 · Five questions · Open this day only

  1. 1. Number

    Calculate: 927 + 254

    Answer: 927 + 254 = 1181
  2. 2. Algebra

    Solve: x⁄2 = 5.5

    Answer: x = 11
  3. 3. Geometry

    Opposite = 10cm, adjacent = 19cm. Calculate the angle

    Answer: 27.8°
  4. 4. Ratio

    Simplify the ratio 5m:500cm

    Answer: 1:100
  5. 5. Statistics

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

    Answer: 2⁄7

Wednesday 25 February 2026

Keystones #56 · 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

    Solve: 7x = 21

    Answer: x = 3
  3. 3. Geometry

    Find the perimeter: hypotenuse = 22cm, one side = 13cm

    Answer: 52.7cm
  4. 4. Ratio

    Calculate 35.2% of 281

    Answer: 98.91
  5. 5. Statistics

    Calculate the mean of: 35, 38, 26, 32, 6, 36, 38, 45

    Answer: 32

Thursday 26 February 2026

Keystones #57 · Five questions · Open this day only

  1. 1. Number

    Add: 4⁄5 + 5⁄8

    Answer: 57⁄40
  2. 2. Algebra

    Solve: 8x = 64

    Answer: x = 8
  3. 3. Geometry

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

    Answer: 47.7°
  4. 4. Ratio

    Calculate 27.7% of 938

    Answer: 259.83
  5. 5. Statistics

    Calculate the mean of: 44, 23, 15, 7, 28, 20, 31

    Answer: 24

Friday 27 February 2026

Keystones #58 · Five questions · Open this day only

  1. 1. Number

    The sum of three consecutive numbers is 135. What are the numbers?

    Answer: 44, 45, and 46
  2. 2. Algebra

    Factorise fully: 20x² + 35x

    Answer: 5x(4x + 7)
  3. 3. Geometry

    Find perimeter: adjacent = 12cm, angle = 43°

    Answer: 39.6cm
  4. 4. Ratio

    Simplify the ratio 7m:700cm

    Answer: 1:100
  5. 5. Statistics

    A spinner has 2 red, 4 blue and 5 green sections. Probability of landing on red?

    Answer: 2⁄11