Representing numbers: Word names

Representing numbers: Word names

Lessons

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
  • Introduction
    Introduction to Number Word Names:
    a)
    How to write numbers 0-100 as their word names

    b)
    Writing big multi-digit numbers as word names

    c)
    Writing different types of fractions as word names

    d)
    Three methods to write decimals as word names

    e)
    Writing money amounts as word names


  • 1.
    Representing Numbers (up to 1000s) Using Word Names
    Write the number as its word name (using letters):

    a)
    18

    b)
    63

    c)
    752

    d)
    4,921


  • 2.
    Representing Numbers (up to 1000s) Using Word Names
    Write the multi-digit number as its word name (using letters):

    a)
    26,178

    b)
    345,912

    c)
    5,731,968

    d)
    1,024,037


  • 3.
    Representing Fractions Using Word Names
    Write the fraction as its word name (using letters):

    a)
    58\frac{5}{8}

    b)
    1421\frac{14}{21}

    c)
    287345\frac{287}{345}

    d)
    9472\frac{94}{72}

    e)
    6753\frac{67}{53}

    f)
    834\frac{3}{4}

    g)
    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
    a)
    0.07

    b)
    2.084

    c)
    41.59


  • 5.
    Representing Money Amounts Using Word Names
    Write the money amount as its word name (using letters):

    a)
    $35.96

    b)
    $2,488.71

    c)
    $6,092.34


  • 6.
    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.