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Lintel Apr 20 - 26 25 questions
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Monday 20 April 2026

Keystones #110 · Five questions · Open this day only

  1. 1. Number

    Multiply: 2.5 × 107 × 7.2 × 105

    Answer: 1.8 × 1013
  2. 2. Algebra

    Solve: x² -5x - 14 = 0

    Answer: x = 7 or x = -2
  3. 3. Geometry

    Adjacent = 23cm, hypotenuse = 32cm. Find the angle

    Answer: 44°
  4. 4. Ratio

    After a 20% decrease, a value is 176.8. What was the original?

    Answer: 221
  5. 5. Statistics

    Find the range of: -3, 29, -23, 23, 31

    Answer: 54

Tuesday 21 April 2026

Keystones #111 · Five questions · Open this day only

  1. 1. Number

    Calculate: 2.3 × 104 × 1.9 × 104

    Answer: 4.37 × 108
  2. 2. Algebra

    Solve: x² - 13x + 42 = 0

    Answer: x = -6 or x = -7
  3. 3. Geometry

    Opposite = 11cm, adjacent = 11cm. Calculate the angle

    Answer: 45°
  4. 4. Ratio

    After a 27% decrease, a value is 140.89. What was the original?

    Answer: 193
  5. 5. Statistics

    Calculate the range of: 54, 75, 64, 48, 36, 71

    Answer: 39

Wednesday 22 April 2026

Keystones #112 · Five questions · Open this day only

  1. 1. Number

    Multiply: 6 × 106 × 2.2 × 105

    Answer: 1.32 × 1012
  2. 2. Algebra

    Solve: x² - 9x + 14 = 0

    Answer: x = -7 or x = -2
  3. 3. Geometry

    Adjacent = 29cm, hypotenuse = 34cm. Find the angle

    Answer: 31.5°
  4. 4. Ratio

    After a 20% decrease, a value is 301.6. What was the original?

    Answer: 377
  5. 5. Statistics

    Calculate the range of: 22, 79, 77, 55, 27, 75

    Answer: 57

Thursday 23 April 2026

Keystones #113 · Five questions · Open this day only

  1. 1. Number

    Calculate: 8 × 104 × 6.2 × 105

    Answer: 4.96 × 1010
  2. 2. Algebra

    Solve: x² -4x - 21 = 0

    Answer: x = 7 or x = -3
  3. 3. Geometry

    Opposite = 20cm, adjacent = 13cm. Calculate the angle

    Answer: 57°
  4. 4. Ratio

    After a 24% decrease, a value is 286.52. What was the original?

    Answer: 377
  5. 5. Statistics

    Find the range of: -18, 6, 8, -23, 34

    Answer: 57

Friday 24 April 2026

Keystones #114 · Five questions · Open this day only

  1. 1. Number

    Calculate: 9.2 × 103 × 1.5 × 103

    Answer: 1.38 × 107
  2. 2. Algebra

    Solve: x² + 3x - 18 = 0

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

    Opposite = 11cm, adjacent = 13cm. Calculate the angle

    Answer: 40.2°
  4. 4. Ratio

    A price of £481.12 includes a 24% increase. What was the price before the increase?

    Answer: £388.00
  5. 5. Statistics

    Calculate the range of: 54, 50, 30, 56, 35, 100

    Answer: 70