2007-09-10 16:43:48 · 9 answers · asked by texan3715 1 in Science & Mathematics ➔ Mathematics
27 / 63 - 28 / 63 = - 1 / 63
2007-09-11 07:54:29 · answer #1 · answered by Como 7 · 2⤊ 0⤋
The common denominator is 63...so 63 divided by 7 = 9 X3 =27 and 63 divided by 9 = 7 X 4=28
27/63 - 28/63 = -1/63
2007-09-10 16:49:11 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Find the least common denominator: 7*9=63
set each fraction equal to x / 63.
3 / 7 = x / 63 x = 27
4 / 9 = x / 63 x = 28
27 / 63 - 28 / 63 = - 1 / 63
2007-09-10 16:49:05 · answer #3 · answered by Regina 1 · 0⤊ 0⤋
First you must establish the LCD or least common denominator. This would be 63 because 7 x 9 = 63 Thus 27/63 - 28/63 = -1/63 There's your answer. Thanks for an easy 2 points!!
2007-09-10 16:54:08 · answer #4 · answered by Emissary 6 · 0⤊ 0⤋
find a common denominator
3/7-4/9 multiply each with the different denominator and plug it also to the numerator
27/63 - 28/63= -1/63
2007-09-10 16:47:33 · answer #5 · answered by Anonymous · 0⤊ 0⤋
3/7 - 4/9
get the LCD = 7(9) = 63
divide each LCD to each denominator then multiply to the numerator
you will get: [9(3) - 7(4)] / 63
(27 - 28) / 63
= -1/63
2007-09-10 16:57:12 · answer #6 · answered by ferdie 2 · 0⤊ 1⤋
change the denominators to common denominators
like 63...
Then it would turn into 27/63 - 28/63... then you subtract and simplify... which would make it -1/63
2007-09-10 16:47:54 · answer #7 · answered by Anonymous · 0⤊ 0⤋
27-28/63 =-1/63
2007-09-10 16:54:38 · answer #8 · answered by xandyone 5 · 0⤊ 0⤋
(3/7) * (9/9) - (4/9)*(7/7)
27/63 - 28/63
-1/63
2007-09-10 16:51:22 · answer #9 · answered by Anon 2 · 0⤊ 0⤋