does the negative sign on the faction mean that both the numerator and the denomanator shoud be treated as negative numbers when used in cross multiplication?

- Feb 23rd 2011, 02:27 AMalyosha2Subtracting from a negative fraction. (Signs in cross multiplication)

does the negative sign on the faction mean that both the numerator and the denomanator shoud be treated as negative numbers when used in cross multiplication? - Feb 23rd 2011, 02:47 AMDrSteve
- Feb 23rd 2011, 03:34 AMWilmer
-1-1/3 = -(1 + 1/3) = ?

Sometimes easier I find:

8 - 2/3 - 3/5 ; multiply by -1:

= -8 + 2/3 + 3/5

= -8 + 10/15 + 9/15

= -8 + 19/15

= -120/15 + 19/15 ; multiply by -1:

= 120/15 - 19/15

= 101/15 - Feb 23rd 2011, 03:36 AMalyosha2
- Feb 23rd 2011, 03:53 AMalyosha2
???

- Feb 23rd 2011, 03:56 AMHallsofIvy
- Feb 23rd 2011, 05:30 AMDrSteve
- Feb 23rd 2011, 07:59 AMalyosha2
- Feb 23rd 2011, 08:04 AMPlato