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Grade 9 · Exponents
Negative Exponents & Scientific Notation (Grade 9)
MEMORANDUM
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  / 12

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.
    (1)
    1/32 = 1/9✓ (1)
  2. 2
    Write 2−4 as a fraction.
    (1)
    1/16✓ (1)
  3. 3
    Write 1/x5 using a negative exponent.
    (1)
    x−5✓ (1)
  4. 4
    Simplify: y3 ÷ y7 (positive exponents only).
    (2)
    y−4 = 1/y4✓✓ (2)
  5. 5
    Calculate: 10−3
    (1)
    1/(1 000) = 0,001✓ (1)
  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.
    (1)
    0,031✓ (1)
  9. 9
    Write 8,04 × 105 as an ordinary number.
    (1)
    804 000✓ (1)
TOTAL: 12 marks
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