what is - 7/9 less 7/15 ?
2007-10-24 11:11:19 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
-7 .. 7
--- - ---
9 ... 15
First you need a common denominator. The lowest common denominator is 45. So multiply the first fraction by 5 on top and bottom.
-35 ... 7
----- - ----
. 45 . 15
And multiply the second fraction by 3 on top and bottom:
-35 .. 21
----- - ----
. 45 . 45
Now you have the same denominator so you can subtract the numerators:
(-35 - 21)
-------------
..... 45
Simplify the numerator:
-56
-----
45
If you can reduce further, do that. In this case, you are done except for turning it into a mixed fraction:
-1 11/45
2007-10-24 11:20:19 · answer #1 · answered by Puzzling 7 · 0⤊ 0⤋
- 7/9 - 7/15 common factor = 45
45/9 = 5 * 7 = -35
45/15 = 3 * 7 = 21
(-35-21)/45 = -56/45
answer = -56/45 = -1.244444444
2007-10-24 20:23:31 · answer #2 · answered by Eduardo (lalo) Leal 2 · 0⤊ 0⤋
-7/9 - 7/15
(-7*5) -(7*3)/45
-56/45
2007-10-24 18:17:00 · answer #3 · answered by xandyone 5 · 0⤊ 0⤋