Calculate in Standard Form

Calculate, giving answers in standard form:

  1. (3 × 105) × (2 × 103)
  2. (6 × 107) ÷ (3 × 104)
  3. (4 × 10-2) × (5 × 10-3)
  4. (9 × 108) ÷ (3 × 10-2)

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