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Lintel Jul 27 - Aug 2 25 questions
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Monday 27 July 2026

Keystones #208 · Five questions · Open this day only

  1. 1. Number

    Multiply: 9.4 × 107 × 5.4 × 103

    Answer: 5.08 × 1011
  2. 2. Algebra

    Solve: x² -2x - 15 = 0

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

    Opposite = 14cm, adjacent = 12cm. Calculate the angle

    Answer: 49.4°
  4. 4. Ratio

    After a 18% decrease, a value is 283.72. What was the original?

    Answer: 346
  5. 5. Statistics

    Calculate the range of: 118, 46, 85, 104, 112, 86

    Answer: 72

Tuesday 28 July 2026

Keystones #209 · Five questions · Open this day only

  1. 1. Number

    Multiply: 8.8 × 104 × 5.5 × 105

    Answer: 4.84 × 1010
  2. 2. Algebra

    Solve: x² -4x - 21 = 0

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

    Opposite = 8cm, adjacent = 16cm. Calculate the angle

    Answer: 26.6°
  4. 4. Ratio

    After a 27% decrease, a value is 183.23. What was the original?

    Answer: 251
  5. 5. Statistics

    Calculate the range of: 34, 38, 57, 21, 38, 38

    Answer: 36

Wednesday 29 July 2026

Keystones #210 · Five questions · Open this day only

  1. 1. Number

    Calculate: 9.8 × 104 × 8.4 × 105

    Answer: 8.232 × 1010
  2. 2. Algebra

    Solve: x² - 8x + 15 = 0

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

    Adjacent = 14cm, hypotenuse = 25cm. Find the angle

    Answer: 55.9°
  4. 4. Ratio

    After a 19% decrease, a value is 256.77. What was the original?

    Answer: 317
  5. 5. Statistics

    Find the range of: 18, 30, 41, -27, 3

    Answer: 68

Thursday 30 July 2026

Keystones #211 · Five questions · Open this day only

  1. 1. Number

    Calculate: 7.4 × 105 × 4 × 105

    Answer: 2.96 × 1011
  2. 2. Algebra

    Solve: x² - 6x + 8 = 0

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

    Opposite = 8cm, adjacent = 13cm. Calculate the angle

    Answer: 31.6°
  4. 4. Ratio

    After a 29% decrease, a value is 336.54. What was the original?

    Answer: 474
  5. 5. Statistics

    Find the range of: 29, -3, 37, -21, 25

    Answer: 58

Friday 31 July 2026

Keystones #212 · Five questions · Open this day only

  1. 1. Number

    Multiply: 5.2 × 105 × 7.4 × 104

    Answer: 3.85 × 1010
  2. 2. Algebra

    Solve: x² -2x - 8 = 0

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

    Adjacent = 22cm, hypotenuse = 34cm. Find the angle

    Answer: 49.7°
  4. 4. Ratio

    After a 19% decrease, a value is 349.92. What was the original?

    Answer: 432
  5. 5. Statistics

    Calculate the range of: 37, 86, 107, 71, 53, 91

    Answer: 70