Unit 4, Lesson 5
Compare and Order Decimals in Different Notations
Grade 4
Activity 2
American athlete Carl Lewis won 10 Olympic medals and 10 World Championships in track and field— 100-meter dash, 200-meter dash, and long jump.
Here are some long jump records from his career.| year | distance (meters) |
|---|---|
| 1979 | 8.13 |
| 1980 | 8.35 |
| 1982 | 8.7 |
| 1983 | 8.79 |
| 1984 | 8.24 |
| 1987 | 8.6 |
| 1991 | 8.87 |
- On this list, which distance is his shortest jump? Which is his longest jump?
-
Here are the top distances, in meters, of 3 other American long jumpers.
- Bob Beamon:
- Jarrion Lawson:
- Mike Powell:
Student Section Summary
We learned to express tenths and hundredths in decimal notation, locate them on a number line, and compare them.
We learned written in decimal notation is 0.1, and that this number is read “1 tenth.” We also learned written in decimal notation is 0.01 and is read “1 hundredth.”
The table shows some more examples of tenths and hundredths in decimal notation.
- Because and are equivalent, 0.5 and 0.50 are also equivalent.
- Likewise, and are equivalent, so 1.7 and 1.70 are also equivalent.
| fraction | decimal notation |
|---|---|
| 0.04 | |
| 0.23 | |
| 0.5 | |
| 0.50 | |
| 1.7 | |
| 1.70 |
Numbers in decimal notation can be located on a number line to help compare them.
Example:
The decimal 0.24 is equivalent to , which is between and (or between and ) on the number line. We can see 0.24 is greater than 0.08 and less than 0.61.