Scientific Notation

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Across
  1. 3. 4x(2x10^1)
  2. 4. 2x10^1
  3. 5. 4x10^2
  4. 6. (18x10^5):2
  5. 7. 2x(3x10^3)
  6. 8. 20x10^3
Down
  1. 1. 3000000000
  2. 2. 5x10^6
  3. 3. 8x10^4
  4. 5. 4.61x10^9