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Lintel Jan 22 - 28 25 questions
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Monday 26 January 2026

Keystones #26 · Five questions · Open this day only

  1. 1. Number

    Calculate: 799 + 983

    Answer: 799 + 983 = 1782
  2. 2. Algebra

    Solve: 5x = 75

    Answer: x = 15
  3. 3. Geometry

    Adjacent = 29cm, hypotenuse = 43cm. Find the angle

    Answer: 47.6°
  4. 4. Ratio

    Simplify: 10:12:12

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

    A bag has 4 red and 7 blue balls. What is the probability of picking a red ball?

    Answer: 4⁄11

Tuesday 27 January 2026

Keystones #27 · Five questions · Open this day only

  1. 1. Number

    Calculate: 994 + 672

    Answer: 1666
  2. 2. Algebra

    Solve: x⁄8 = 4.875

    Answer: x = 39
  3. 3. Geometry

    Calculate the area of a circle with diameter 18cm

    Answer: 254.47cm²
  4. 4. Ratio

    Find 18% of 146

    Answer: 26.28
  5. 5. Statistics

    Find the range of: 14, 27, -15, -6, -18

    Answer: 45

Wednesday 28 January 2026

Keystones #28 · Five questions · Open this day only

  1. 1. Number

    Calculate: 996 + 584

    Answer: 1580
  2. 2. Algebra

    Factorise fully: 35x² + 15x

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

    Opposite = 13cm, adjacent = 10cm. Calculate the angle

    Answer: 52.4°
  4. 4. Ratio

    Simplify: 10:4:4

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

    A spinner has 3 red, 4 blue and 2 green sections. Probability of landing on red?

    Answer: 1⁄3

Thursday 29 January 2026

Keystones #29 · Five questions · Open this day only

  1. 1. Number

    Add: 3⁄6 + 3⁄7

    Answer: 13⁄14
  2. 2. Algebra

    What is the next term? 5, 20, 80, 320, ...

    Answer: 1280
  3. 3. Geometry

    Adjacent = 27cm, hypotenuse = 32cm. Find the angle

    Answer: 32.5°
  4. 4. Ratio

    Find 31% of 410

    Answer: 127.1
  5. 5. Statistics

    Calculate the mean of: 30, 5, 49, 36, 41, 37, 47

    Answer: 35

Friday 30 January 2026

Keystones #30 · Five questions · Open this day only

  1. 1. Number

    Calculate: 302 + 626

    Answer: 302 + 626 = 928
  2. 2. Algebra

    Solve: 2x = 16

    Answer: x = 8
  3. 3. Geometry

    Opposite = 18cm, adjacent = 17cm. Calculate the angle

    Answer: 46.6°
  4. 4. Ratio

    Find 57% of 182

    Answer: 103.74
  5. 5. Statistics

    Calculate the mean of: 13, 39, 9, 40, 31, 10, 21, 43

    Answer: 25.8