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Example 1.6 from Prealgebra, 1.1 Introduction to Whole Numbers
Introduction to Whole Numbers: example 1.6
Write the following numbers using digits.
- ⓐ fifty-three million, four hundred one thousand, seven hundred forty-two
- ⓑ nine billion, two hundred forty-six million, seventy-three thousand, one hundred eighty-nine
Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.
Solution
ⓐ Identify the words that indicate periods.
Except for the first period, all other periods must have three places. Draw three blanks to indicate the number of places needed in each period. Separate the periods by commas.
Then write the digits in each period.
Put the numbers together, including the commas. The number is
ⓑ Identify the words that indicate periods.
Except for the first period, all other periods must have three places. Draw three blanks to indicate the number of places needed in each period. Separate the periods by commas.
Then write the digits in each period.
The number is
Notice that in part ⓑ, a zero was needed as a place-holder in the hundred thousands place. Be sure to write zeros as needed to make sure that each period, except possibly the first, has three places.
Your turn
The book's Try It right after this example: same idea, new numbers. Only the answer is given.
Write each number in standard form:
fifty-three million, eight hundred nine thousand, fifty-one.
How did it go?