# 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!
• 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”

• 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. $\frac{2}{9}$ = “two–ninths” vs. $\frac{1}{5}$ = “one–fifth”
• Multi-digit fractions ex. $\frac{43}{71}$ = “forty-three seventy-firsts” (NO dash in between)
• Improper fractions ex. $\frac{11}{7}$ = “eleven–sevenths”
• Mixed fractions ex. 6$\frac{3}{5}$ = “six and three–fifths” (write “and” after whole number)
• Special fraction names ex. $\frac{1}{2}$ = “one–half”; $\frac{3}{2}$ = “three–halves”; $\frac{1}{4}$ = “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) $\frac{5}{8}$ b) $\frac{14}{21}$ c) $\frac{287}{345}$ d) $\frac{94}{72}$ e) $\frac{67}{53}$ f) 8$\frac{3}{4}$ g) 5$\frac{1}{2}$ • 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.