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Lintel Jan 12 - 18 25 questions
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Monday 12 January 2026

Keystones #12 · Five questions · Open this day only

  1. 1. Number

    Calculate: 6.4 × 105 × 1.8 × 104

    Answer: 1.152 × 1010
  2. 2. Algebra

    Solve: x² -7x - 8 = 0

    Answer: x = 8 or x = -1
  3. 3. Geometry

    Opposite = 14cm, adjacent = 20cm. Calculate the angle

    Answer: 35°
  4. 4. Ratio

    A price of £404.74 includes a 18% increase. What was the price before the increase?

    Answer: £343.00
  5. 5. Statistics

    Calculate the range of: 83, 113, 84, 71, 73, 47

    Answer: 66

Tuesday 13 January 2026

Keystones #13 · Five questions · Open this day only

  1. 1. Number

    Multiply: 6.1 × 106 × 7.5 × 106

    Answer: 4.58 × 1013
  2. 2. Algebra

    Solve: x² - 6x + 8 = 0

    Answer: x = -2 or x = -4
  3. 3. Geometry

    Adjacent = 24cm, hypotenuse = 29cm. Find the angle

    Answer: 34.1°
  4. 4. Ratio

    A price of £477.19 includes a 19% increase. What was the price before the increase?

    Answer: £401.00
  5. 5. Statistics

    Find the range of: -27, 24, 28, -19, 43

    Answer: 70

Wednesday 14 January 2026

Keystones #14 · Five questions · Open this day only

  1. 1. Number

    Multiply: 3.6 × 105 × 5.6 × 104

    Answer: 2.02 × 1010
  2. 2. Algebra

    Solve: x² - 6x + 9 = 0

    Answer: x = -3 or x = -3
  3. 3. Geometry

    Adjacent = 16cm, hypotenuse = 27cm. Find the angle

    Answer: 53.7°
  4. 4. Ratio

    After a 17% decrease, a value is 279.71. What was the original?

    Answer: 337
  5. 5. Statistics

    Calculate the range of: 46, 58, 56, 84, 76, 61

    Answer: 38

Thursday 15 January 2026

Keystones #15 · Five questions · Open this day only

  1. 1. Number

    Calculate: 3.8 × 105 × 9 × 105

    Answer: 3.42 × 1011
  2. 2. Algebra

    Solve: x² -x - 30 = 0

    Answer: x = 6 or x = -5
  3. 3. Geometry

    Opposite = 13cm, adjacent = 9cm. Calculate the angle

    Answer: 55.3°
  4. 4. Ratio

    After a 21% decrease, a value is 193.55. What was the original?

    Answer: 245
  5. 5. Statistics

    Find the range of: -25, -21, 17, 23, -2

    Answer: 48

Friday 16 January 2026

Keystones #16 · Five questions · Open this day only

  1. 1. Number

    Multiply: 8.3 × 107 × 6.5 × 104

    Answer: 5.4 × 1012
  2. 2. Algebra

    Solve: x² -2x - 8 = 0

    Answer: x = 4 or x = -2
  3. 3. Geometry

    Adjacent = 23cm, hypotenuse = 35cm. Find the angle

    Answer: 48.9°
  4. 4. Ratio

    After a 30% decrease, a value is 311.5. What was the original?

    Answer: 445
  5. 5. Statistics

    Find the range of: 36, 50, -1, 30, -27

    Answer: 77