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Read whole numbers to the millions

Whole numbers from 0 through 999,999,999 are interpreted and named by grouping digits into three-digit periods—millions, thousands, and ones—and applying place value within each period. The learner connects standard numerals, number names, and expanded notation, understands that zero may serve as a placeholder without being spoken, and preserves the value indicated by each digit; this scope does not include numbers beyond the millions period, decimals, or fractional number names.

Detailed Explanation: Read whole numbers to the millions

To read a whole number to the millions, group its digits into periods of three, starting from the right:

  • Millions period
  • Thousands period
  • Ones period

Each period can have up to three digits.

Example: Read (407,032,015)(407{,}032{,}015).

  1. Separate the number into periods:

407∣032∣015 407\mid032\mid015

So the number has:

  • (407)(407) millions
  • (032)(032) thousands
  • (015)(015) ones

  1. Read each period from left to right:

    • (407)(407) is four hundred seven million.
    • (032)(032) is thirty-two thousand. Do not say “zero thirty-two.”
    • (015)(015) is fifteen. Do not say “zero fifteen.”

  2. Put the parts together:

four hundred seven million thirty-two thousand fifteen \boxed{\text{four hundred seven million thirty-two thousand fifteen}}

The zeros are placeholders. They keep the digits in their correct places, even though they are not spoken.

The expanded notation shows the value of each nonzero digit:

407,032,015=400,000,000+7,000,000+30,000+2,000+10+5407{,}032{,}015 = 400{,}000{,}000+7{,}000{,}000+30{,}000+2{,}000+10+5

Learn by doing: Read whole numbers to the millions

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