Textbook pg.61, no.16

Question: 

       16.)  Bella is more comfortable working with integers than with positive and negative decimal numbers. This is her way of understanding -4.3 + 2.5 .

•  -4.3 is -43/10 or -43 tenths.

• 2.5 is 25/10 or 25 tenths.

• -43 tenths + 25 tenths is -18 tenths.

• -18 tenths is -18/10 or -1.8 .

• So, -4.3 + 2.5 = -1.8 .

         a.) Use Bella's method to determine 6.1 + (-3.9) .

             Solution:

     

        b.) How could you modify Bella's method to determine
           1.25 - 3.46 ?

                   * Use hundredths instead of tenths to get the answer.

                          Solution: