4 Chapter 1 Whole Numbers Converting Expanded Form to Standard Form Example 4 Convert to standard form. a. 2 hundreds 5 tens 9 ones b. 1 thousand 2 tens 5 ones Solution: a. 2 hundreds 5 tens 9 ones 259 b. Each place position from the thousands place to the ones place must contain a digit. In this problem, there is no reference to the hundreds place digit. Therefore, we assume 0 hundreds. Thus, 1 thousand 0 hundreds 2 tens 5 ones 1,025 Skill Practice Convert to standard form. 8. 9. 8 thousands 5 hundreds 5 tens 1 one 5 hundred-thousands 4 thousands 8 tens 3 ones Answers 8. 8,551 9. 504,083 10. One billion, four hundred fifty million, three hundred twenty-seven thousand, two hundred fourteen 3. Writing Numbers in Words The word names of some two-digit numbers appear with a hyphen, while others do not. For example: Number Number Name 12 twelve 68 sixty-eight 40 forty 42 forty-two To write a three-digit or larger number, begin at the leftmost group of digits. The number named in that group is followed by the period name, followed by a comma. Then the next period is named, and so on. Writing a Number in Words Example 5 Write 621,417,325 in words. Solution: 621,417,325 six hundred twenty-one million, four hundred seventeen thousand, three hundred twenty-five Notice from Example 5 that when naming numbers, the name of the ones period is not attached to the last group of digits. Also note that for whole numbers, the word and should not appear in word names. For example, 405 should be written as four hundred five. 5 5 5 Skill Practice 10. Write 1,450,327,214 in words.
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