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Lintel May 14 - 20 25 questions
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Monday 18 May 2026

Keystones #138 · Five questions · Open this day only

  1. 1. Number

    Calculate: 455 + 503

    Answer: 455 + 503 = 958
  2. 2. Algebra

    Solve: x⁄2 = 11

    Answer: x = 22
  3. 3. Geometry

    Adjacent = 26cm, hypotenuse = 45cm. Find the angle

    Answer: 54.7°
  4. 4. Ratio

    Simplify: 18:9:15

    Answer: 6:3:5
  5. 5. Statistics

    Find the range of: -13, -22, 41, 9, 10

    Answer: 63

Tuesday 19 May 2026

Keystones #139 · Five questions · Open this day only

  1. 1. Number

    Calculate: 997 + 525

    Answer: 1522
  2. 2. Algebra

    Factorise: 3x² + 2x

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

    Calculate the area of a right triangle with perpendicular sides 10cm and 10cm

    Answer: 50cm²
  4. 4. Ratio

    Simplify: 10:6:4

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

    A bag has 5 red and 6 blue balls. What is the probability of picking a red ball?

    Answer: 5⁄11

Wednesday 20 May 2026

Keystones #140 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 89 + ? = 163

    Answer: 74
  2. 2. Algebra

    Factorise: 2x² + 7x

    Answer: x(2x + 7)
  3. 3. Geometry

    Adjacent = 28cm, hypotenuse = 38cm. Find the angle

    Answer: 42.5°
  4. 4. Ratio

    Simplify: 16:12:20

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

    Find the range of: 37, -27, 34, -8, 27

    Answer: 64

Thursday 21 May 2026

Keystones #141 · Five questions · Open this day only

  1. 1. Number

    Calculate: 1⁄4 + 5⁄6 + 3⁄4

    Answer: 11⁄6
  2. 2. Algebra

    Factorise fully: 18x² + 12x

    Answer: 3x(6x + 4)
  3. 3. Geometry

    Calculate the area of a right triangle with perpendicular sides 11cm and 11cm

    Answer: 60.5cm²
  4. 4. Ratio

    Simplify: 16:8:24

    Answer: 2:1:3
  5. 5. Statistics

    A bag has 6 red and 5 blue balls. What is the probability of picking a red ball?

    Answer: 6⁄11

Friday 22 May 2026

Keystones #142 · Five questions · Open this day only

  1. 1. Number

    Calculate: 447 + 875

    Answer: 447 + 875 = 1322
  2. 2. Algebra

    Solve: x⁄7 = 2

    Answer: x = 14
  3. 3. Geometry

    Adjacent = 29cm, hypotenuse = 34cm. Find the angle

    Answer: 31.5°
  4. 4. Ratio

    Find 71% of 277

    Answer: 196.67
  5. 5. Statistics

    A bag has 4 red and 3 blue balls. What is the probability of picking a red ball?

    Answer: 4⁄7