Section 1.1 Introduction to Whole Numbers 5 Writing a Number in Standard Form Example 6 Write the number in standard form. Six million, forty-six thousand, nine hundred three Solution: six million nine hundred three 5 5 6,046,903 5 forty-six thousand We have seen several examples of writing a number in standard form, in expanded form, and in words. Standard form is the most concise representation. Also note that when we write a four-digit number in standard form, the comma is often omitted. For example, 4,389 is often written as 4389. 4. The Number Line and Order Whole numbers can be visualized as equally spaced points on a line called a number line (Figure 1-2). 0 1 2 3 4 5 6 7 8 9 10 11 12 Figure 1-2 The whole numbers begin at 0 and are ordered from left to right by increasing value. A number is graphed on a number line by placing a dot at the corresponding point. For any two numbers graphed on a number line, the number to the left is less than the number to the right. Similarly, a number to the right is greater than the number to the left. In mathematics, the symbol is used to denote “is less than,” and the symbol means “is greater than.” Therefore, 3 6 5 means 3 is less than 5 5 7 3 means 5 is greater than 3 7 Determining Order Between Two Numbers 6 7. Example 7 Fill in the blank with the symbol or a. 7 0 b. 30 82 Solution: a.7 0 7 b. 30 82 6 6 To visualize the numbers 82 and 30 on the number line, it may be necessary to use a different scale. Rather than setting equally spaced marks in units of 1, we can use units of 10. The number 82 must be somewhere between 80 and 90 on the number line. Answers 11. 14,609 12. 7 13. 6 0 1 2 3 4 5 6 7 8 Skill Practice 11. Write the number in standard form: fourteen thousand, six hundred nine. Skill Practice Fill in the blank with the symbol 6 or 7. 12. 9 5 13. 8 18 0 1 2 3 4 5 6 7 8 9 10 0 10 20 30 40 50 60 70 80 90 100
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