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Grade 9 · Exponents
Negative Exponents & Scientific Notation (Grade 9)
MEMORANDUM
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  / 18

Answer all questions. Show all your working — marks are awarded for method as well as the final answer. Teacher copy: accept any correct equivalent method.

  1. 1
    Write 3−2 as a fraction.
    (2)
    132 = 19✓✓ (2)
  2. 2
    Write 2−4 as a fraction.
    (2)
    116✓✓ (2)
  3. 3
    Write 1x5 using a negative exponent.
    (2)
    x−5✓✓ (2)
  4. 4
    Simplify: y3 ÷ y7 (positive exponents only).
    (2)
    y−4 = 1y4✓✓ (2)
  5. 5
    Calculate: 10−3
    (2)
    11000 = 0,001✓✓ (2)
  6. 6
    Write 62 000 000 in scientific notation.
    (2)
    6,2 × 107✓✓ (2)
  7. 7
    Write 0,0045 in scientific notation.
    (2)
    4,5 × 10−3✓✓ (2)
  8. 8
    Write 3,1 × 10−2 as an ordinary number.
    (2)
    0,031✓✓ (2)
  9. 9
    Write 8,04 × 105 as an ordinary number.
    (2)
    804 000✓✓ (2)
TOTAL: 18 marks
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