Representing numbers: Word names

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Intros
Lessons
  1. Introduction to Number Word Names:
  2. How to write numbers 0-100 as their word names
  3. Writing big multi-digit numbers as word names
  4. Writing different types of fractions as word names
  5. Three methods to write decimals as word names
  6. Writing money amounts as word names
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Examples
Lessons
  1. Representing Numbers (up to 1000s) Using Word Names
    Write the number as its word name (using letters):

    1. 18
    2. 63
    3. 752
    4. 4,921
  2. Representing Numbers (up to 1000s) Using Word Names
    Write the multi-digit number as its word name (using letters):

    1. 26,178
    2. 345,912
    3. 5,731,968
    4. 1,024,037
  3. Representing Fractions Using Word Names
    Write the fraction as its word name (using letters):

    1. 58\frac{5}{8}
    2. 1421\frac{14}{21}
    3. 287345\frac{287}{345}
    4. 9472\frac{94}{72}
    5. 6753\frac{67}{53}
    6. 834\frac{3}{4}
    7. 512\frac{1}{2}
  4. Representing Decimals Using Word Names
    Write the decimal as its word name (using letters):
    • Recall that there are 3 methods for naming decimals
      1. 0.07
      2. 2.084
      3. 41.59
    • Representing Money Amounts Using Word Names
      Write the money amount as its word name (using letters):

      1. $35.96
      2. $2,488.71
      3. $6,092.34
    • Number Word Names - Word Problem
      Read the passage. Rewrite the number word names in standard form.
      • Melanie is doing a science project on butterflies. She learned that their life cycle has four stages: egg, caterpillar, pupa, and adult. She also learned that the oldest butterfly fossils come from fifty-six million years ago. There are about eighteen thousand five hundred butterfly species in the world. She also raised some monarch butterflies and measured them to have a wingspan of about three point nine inches and a weight of about seven tenths four hundredths grams.
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    Practice
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    Topic Notes
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    In this lesson, we will learn:

    • How to write different types of numbers as words
      • numbers, multi-digit numbers, fractions, decimals, money amounts

    Notes:

    • Writing numbers as their word names requires some memorization!
    Representing Numbers : Word Names
      • The numbers 13 to19 all have the same ending of “-teen” (fifteen, sixteen, etc.)
      • All multiples of 10 from 20 to 90 end with “-ty” (thirty, forty, fifty, etc.)
      • Numbers from 21 to 99 have a dash in between (thirty-three, seventy-one, etc.)

    • When you write the word names for big multi-digit numbers:
      • Look at each group of 3 place values.
      • Name the number made by 3 digits and add the type of place value at the end

      Ex. 7, 186, 493 = “seven million one hundred eighty-six thousand four hundred ninety-three”

    Representing Numbers : Word Names

    • When you write fractions as their word names, follow the format: [numerator] – [denominator as an ordinal] [add ‘s’ at the end unless numerator is 1]
      • Proper fractions ex. 29\frac{2}{9} = “two–ninths” vs. 15\frac{1}{5} = “one–fifth”
      • Multi-digit fractions ex. 4371\frac{43}{71} = “forty-three seventy-firsts” (NO dash in between)
      • Improper fractions ex. 117\frac{11}{7} = “eleven–sevenths”
      • Mixed fractions ex. 635\frac{3}{5} = “six and three–fifths” (write “and” after whole number)
      • Special fraction names ex. 12\frac{1}{2} = “one–half”; 32\frac{3}{2} = “three–halves”; 14\frac{1}{4} = “one–quarter”

    • There are 3 ways to write decimals as their word names:
      • Ex. 0.87
        • Reading method: “zero point eight seven”
        • Separate method: eight tenths seven hundredths
        • Condensed method: eighty-seven hundredths
      • Money amounts are a special type of decimal, their word names name the dollar amount and then the cents amount.
        • Ex. $35.46 = thirty-five dollars and forty-six cents