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					      Adding and Subtracting
 LESSON
  2-3 Rational Numbers

Lesson Objectives
Add and subtract decimals and rational numbers with like denominators

Additional Examples
Example 1

In August 2001 at the World University Games in Beijing, China, Jimyria
Hicks ran the 200-meter dash in 24.08 seconds. Her best time at the U.S.
Senior National Meet in June of the same year was 23.35 seconds. How
much faster did she run in June?
           24.08
           23.35              Align the decimals.




       She ran                               second faster in June.


Example 2

Use a number line to find each sum.
  A. 0.3             ( 1.2)
                                                                           Move right          units.

                                                                           From          , move left
                 1.4          1.0                0.4       0    0.4

                                                                                  units.

       You finish at                             , so 0.3      ( 1.2)              .
       1         2
  B. 5           5
                                                                           Move right        units.

                                                                           From        , move right
             0       1    2     3     4      1   11
                     5    5     5     5           5
                                                                                  units.

                                                  1    2
       You finish at                      , so 5       5
                                                                 .



Copyright © by Holt, Rinehart and Winston.
All rights reserved.                                                  30                                Holt Mathematics

				
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