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					 LESSON 2-3 CONTINUED


Example 3

Add or subtract. Write each answer in simplest form.
            2       5
  A.        9       9
            2       5
            9       9                 9
                                                                     Subtract numerators. Keep
                                                                     the denominator.
     6               3
  B. 7               7
       6             3
       7             7                            7
                                                                     Add numerators. Keep
                                                                     the denominator.


Example 4

Evaluate each expression for the given value of the variable.
  A. 12.1             x for x                 0.1

       12.1           (                   )           Substitute              for x.

                                                      Think: 12.1        ( 0.1)   12.1   0.1
        7                                     1
  B. 10           m for m               3 10

        7
       10
                                                      Substitute              for m.


        7                                               1    3(10)       1
                                                      3 10
       10               10                                      10           10


                                                      Add numerators. Keep the denominator.
                10                     10




Try This
1. Tom ran the 100-meter dash in 11.5 seconds last year. This year he
   improved his time by 0.568 seconds. How fast did Tom run the
   100-meter dash this year?


Copyright © by Holt, Rinehart and Winston.
All rights reserved.                                                31                           Holt Mathematics

				
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