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Lintel Apr 30 - May 6 25 questions
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Monday 27 April 2026

Keystones #117 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 65 + ? = 144

    Answer: 79
  2. 2. Algebra

    Solve: x⁄3 = 6.3333333333333

    Answer: x = 19
  3. 3. Geometry

    Adjacent = 17cm, hypotenuse = 30cm. Find the angle

    Answer: 55.5°
  4. 4. Ratio

    Simplify: 18:15:15

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

    A bag has 6 red and 7 blue balls. What is the probability of picking a red ball?

    Answer: 6⁄13

Tuesday 28 April 2026

Keystones #118 · Five questions · Open this day only

  1. 1. Number

    Calculate: 196 + 947

    Answer: 196 + 947 = 1143
  2. 2. Algebra

    Find the next term: 1, 4, 10, 19, ...

    Answer: 31
  3. 3. Geometry

    Adjacent = 12cm, hypotenuse = 26cm. Find the angle

    Answer: 62.5°
  4. 4. Ratio

    Find 81% of 304

    Answer: 246.24
  5. 5. Statistics

    Calculate the mean of: 10, 33, 30, 9, 8, 30

    Answer: 20

Wednesday 29 April 2026

Keystones #119 · Five questions · Open this day only

  1. 1. Number

    Calculate: 991 + 733

    Answer: 1724
  2. 2. Algebra

    Solve: 5x = 65

    Answer: x = 13
  3. 3. Geometry

    Calculate the area of a circle with diameter 20cm

    Answer: 314.16cm²
  4. 4. Ratio

    Find 43% of 159

    Answer: 68.37
  5. 5. Statistics

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

    Answer: 1⁄2

Thursday 30 April 2026

Keystones #120 · Five questions · Open this day only

  1. 1. Number

    The sum of three consecutive numbers is 126. What are the numbers?

    Answer: 41, 42, and 43
  2. 2. Algebra

    Factorise: 6x² + 5x

    Answer: x(6x + 5)
  3. 3. Geometry

    Adjacent = 22cm, hypotenuse = 38cm. Find the angle

    Answer: 54.6°
  4. 4. Ratio

    Simplify: 9:15:18

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

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

    Answer: 1⁄3

Friday 1 May 2026

Keystones #121 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 61 + ? = 136

    Answer: 75
  2. 2. Algebra

    Solve: x⁄3 = 3.3333333333333

    Answer: x = 10
  3. 3. Geometry

    Calculate the hypotenuse when a = 10cm and b = 8cm

    Answer: 12.81cm
  4. 4. Ratio

    Simplify: 6:12:6

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

    Find the range of: -24, 4, 1, 25, -14

    Answer: 49