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There are three main ways to express it:

  1. With exponents: (4 x 102) + (2 x 101) + (9 x 100) + (9/101) + (3/102) + (8/103)
  2. Without exponents: (4 x 100) + (2 x 10) + (9 x 1) + (9/10) + (3/100) + (8/1000)
  3. In words: Four hundred twenty-nine and nine hundred thirty-eight thousandths
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10y ago

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