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Lintel Dec 15 - 21 25 questions
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Monday 15 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    68000000

    Answer: 6.8 × 107
  2. 2. Algebra

    Factorise: x² + 4x - 21

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

    Adjacent = 14cm, angle = 37°. Find opposite

    Answer: 10.5cm
  4. 4. Ratio

    Simplify the ratio 3m:300cm

    Answer: 1:100
  5. 5. Statistics

    Calculate the mean of: 34, 11, 5, 36, 40, 6, 46

    Answer: 25.4

Tuesday 16 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    0.037

    Answer: 3.7 × 10-2
  2. 2. Algebra

    Factorise: x² + 3x - 4

    Answer: (x + 4)(x - 1)
  3. 3. Geometry

    Hypotenuse = 16cm, angle = 61°. Find adjacent side

    Answer: 7.8cm
  4. 4. Ratio

    £258.00 is shared between A and B in the ratio 2:1. How much does A receive?

    Answer: £172.00
  5. 5. Statistics

    Calculate the mean of: 21, 11, 21, 27, 17, 44, 7, 39

    Answer: 23.4

Wednesday 17 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    67000

    Answer: 6.7 × 104
  2. 2. Algebra

    Factorise: x² - 11x + 28

    Answer: (x - 4)(x - 7)
  3. 3. Geometry

    Adjacent = 29cm, angle = 33°. Find opposite

    Answer: 18.8cm
  4. 4. Ratio

    In ratio 4:1:4, what fraction is the second part?

    Answer: 19
  5. 5. Statistics

    The mean of 4 numbers is 29. If 3 of them are 34, 35, 26, what is the missing number?

    Answer: 21

Thursday 18 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    810000

    Answer: 8.1 × 105
  2. 2. Algebra

    Factorise: x² - 8x + 12

    Answer: (x - 2)(x - 6)
  3. 3. Geometry

    Adjacent = 10cm, angle = 30°. Find opposite

    Answer: 5.8cm
  4. 4. Ratio

    Simplify the ratio 2m:200cm

    Answer: 1:100
  5. 5. Statistics

    The mean of 4 numbers is 24. If 3 of them are 19, 27, 41, what is the missing number?

    Answer: 9

Friday 19 December 2025

Keystones #1 · Five questions · Open this day only

  1. 1. Number

    0.00048

    Answer: 4.8 × 10-4
  2. 2. Algebra

    Factorise: x² + 2x - 35

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

    Hypotenuse = 27cm, angle = 56°. Find adjacent side

    Answer: 15.cm
  4. 4. Ratio

    £245.00 is shared between A and B in the ratio 2:5. How much does A receive?

    Answer: £70.00
  5. 5. Statistics

    Calculate the mean of: 44, 18, 34, 46, 17, 13

    Answer: 28.7