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Lintel Jul 13 - 19 25 questions
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Monday 13 July 2026

Keystones #194 · Five questions · Open this day only

  1. 1. Number

    12000

    Answer: 1.2 × 104
  2. 2. Algebra

    Factorise: x² - 4x + 4

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

    Adjacent = 30cm, angle = 36°. Find opposite

    Answer: 21.8cm
  4. 4. Ratio

    Simplify the ratio 6m:600cm

    Answer: 1:100
  5. 5. Statistics

    Calculate the mean of: 15, 38, 13, 45, 25, 10, 16, 9

    Answer: 21.4

Tuesday 14 July 2026

Keystones #195 · Five questions · Open this day only

  1. 1. Number

    34000

    Answer: 3.4 × 104
  2. 2. Algebra

    Factorise: x² - 9x + 18

    Answer: (x - 6)(x - 3)
  3. 3. Geometry

    Adjacent = 20cm, angle = 59°. Find opposite

    Answer: 33.3cm
  4. 4. Ratio

    Divide 132 in the ratio 2:1:3

    Answer: 44, 22 and 66
  5. 5. Statistics

    The mean of 4 numbers is 34. If 3 of them are 31, 40, 30, what is the missing number?

    Answer: 35

Wednesday 15 July 2026

Keystones #196 · Five questions · Open this day only

  1. 1. Number

    0.00024

    Answer: 2.4 × 10-4
  2. 2. Algebra

    Factorise: x² + 2x - 35

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

    Hypotenuse = 38cm, angle = 44°. Find adjacent side

    Answer: 27.3cm
  4. 4. Ratio

    Divide 40 in the ratio 1:2:1

    Answer: 10, 20 and 10
  5. 5. Statistics

    Calculate the mean of: 6, 16, 32, 9, 36, 45, 31

    Answer: 25

Thursday 16 July 2026

Keystones #197 · Five questions · Open this day only

  1. 1. Number

    58000000

    Answer: 5.8 × 107
  2. 2. Algebra

    Factorise: x² + x - 20

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

    Adjacent = 28cm, angle = 53°. Find opposite

    Answer: 37.2cm
  4. 4. Ratio

    Simplify: 6:8:12

    Answer: 3:4:6
  5. 5. Statistics

    Calculate the mean of: 50, 29, 9, 37, 12, 25, 39, 35

    Answer: 29.5

Friday 17 July 2026

Keystones #198 · Five questions · Open this day only

  1. 1. Number

    0.00062

    Answer: 6.2 × 10-4
  2. 2. Algebra

    Factorise: x² - 7x + 12

    Answer: (x - 4)(x - 3)
  3. 3. Geometry

    Hypotenuse = 24cm, angle = 31°. Find adjacent side

    Answer: 20.6cm
  4. 4. Ratio

    Express the first part of 2:3 as a fraction in simplest form

    Answer: 2⁄5
  5. 5. Statistics

    The mean of 5 numbers is 26. If 4 of them are 21, 45, 43, 43, what is the missing number?

    Answer: -22