# know_it_notebook 2

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```					 LESSON 2-3 CONTINUED

Example 3

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
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

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?