Rounding and Estimation - Rounding and Estimation I The...

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Rounding and Estimation I. The Number Line On of the most useful ways of displaying numbers is the number line which is defined as follows. First draw a line. then label a number on the line (usually 0). To the left of that number represents values below and to the right of that number represents values above that number. We usually make sure that the line has uniform scale. For example if 0 is the central point, and 1 is two cm from 0, than 2 should be 4 cm from zero. Example II. Rounding Whole Numbers According to the census bureau, the population of the United States is 285,868,158. Although this number is precise, it is cumbersome and difficult to remember. Instead of using this number, we would like to be able to write an estimate that contains only the leftmost digit. We could use 200,000,000, but there is a better estimate. If we place this number on the number line, we see that 285,868,158 is between 200,000,000 and 300,000,000. However the population is closer to 300,000,000.
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