how would you subtract 7/15 - 4/45??
2006-10-09 13:10:07 · 10 answers · asked by britiani j 1 in Science & Mathematics ➔ Mathematics
To add or subtract fractions, you need to put them to a common denominator (the bottom number). Then you can add or subtract the numerators. Afterwards, you have to simply the result.
For example,
4/13+7/39
You'd find the lowest common multiple between the two denominators 13 and 39 to be 39. Then you transform the first fraction to have a denominator of 39 by multiplying by 3 (top and bottom), the rest will be obvious:
4/13+7/39
=12/39+7/39
= 19/39
Since 19/39 cannot be further simplified, this is the answer.
Try to proceed the same way with your own problem.
Good luck.
2006-10-09 13:15:55 · answer #1 · answered by mathpath 2 · 0⤊ 0⤋
With any of these, get the denominators the same then subtract.
7/15 = 21/45
So 21/45 - 4/45 = (21-4)/45 = 17/45
2006-10-09 13:13:02 · answer #2 · answered by Math geek 3 · 0⤊ 0⤋
get a common denominator & then subtract the numerator.
so 7/15-4/45...the common denominator is 45.
so
7/15(3/3) -4/45 = 21/45 - 4/45= 17/45.
2006-10-09 13:19:21 · answer #3 · answered by starlove2 6 · 0⤊ 0⤋
First you must find a common demoninator, which in this case is 45. Then you must convert it (7/15 X 3 = 21/45) Then 21/45 - 4/45, just subtract the 4 from 21 to get 17/45, which doesnt reduce.
2006-10-09 13:12:39 · answer #4 · answered by timhasafender 3 · 0⤊ 0⤋
you have to find a common denominator which is 45 and then you multiply 15 by 3 and 7 by 3 so you get 21/45 then subtract to get
17/45
and that can not be reduced so your answer is 17/45
Oh gees, that reminded me!
I have math homework! lol
I hope that helped! :D
2006-10-09 13:19:43 · answer #5 · answered by CaLiFoRnIa_PaGeAnT_GiRl 2 · 0⤊ 0⤋
what you do, you cross mutliply. 7/15 - 4/45. you multiply 45 x 7 and you get 315. then you multiply 15 x 4, which is 60. then you subract 60 from 315, which is 255. that is your new numerator. then you multiply the denominators straight across. 45 x 15 is 675. so you have 315/675. then you reduce. 15 goes into both of those numbers so you divide both numbers by 15. you get 21/45. then you reduce one more time. 3 goes into both of those numbers so you divide both of those by 3. Your answer is 7/15
2006-10-09 13:21:22 · answer #6 · answered by Aaron 3 · 0⤊ 0⤋
7/15 = 21/45
21 - 4 = 17/45
2006-10-09 13:12:48 · answer #7 · answered by Ralph 5 · 0⤊ 0⤋
21/45-4/45=17/45
2006-10-09 13:11:54 · answer #8 · answered by raj 7 · 0⤊ 0⤋
7/15 -4/45
The common denominator is 45
21/45 - 4/45
21-4/45
17/45
The answer is 17/45
The solutioj set is { 17/45 }
2006-10-09 13:49:07 · answer #9 · answered by SAMUEL D 7 · 0⤊ 0⤋
(7/15) - (4/45)
(21/45) - (4/45)
(17/45)
ANS : (17/45)
2006-10-09 13:32:28 · answer #10 · answered by Sherman81 6 · 0⤊ 0⤋