PLESAE HELP
2007-04-03 05:37:43 · 6 answers · asked by thesearenotyours 1 in Science & Mathematics ➔ Mathematics
If you are talking about 1/5, 1/7, and 1/4, 5*7*4 = 140 so the least common denominator (LCD) is 140ths.
Why?
You need to represent all the factors of all the numbers, which in this case is 1, 5, 7, 2, and 2. There are no repeated factors that you can "cancel out."
Here's another example - what is the LCD of 1/6, 1/9, and 1/10?
Here you need 2*3, 3*3, and 2*5. So if you pick 2*3*3*5, you end up covering all the denominators. So the LCD is 90ths, not 6*9*10 = 540ths.
2007-04-03 05:40:58 · answer #1 · answered by Anonymous · 1⤊ 0⤋
1
2007-04-03 05:40:39 · answer #2 · answered by hopeful2010 4 · 2⤊ 0⤋
There is no common denominator of 5, 7, 4. If you mean the least common multiple, the answer is 140.
2007-04-03 05:42:33 · answer #3 · answered by jonmm 4 · 0⤊ 0⤋
If you mean LCD by common denomiantors, it is=5*7*4=140
2007-04-03 06:07:25 · answer #4 · answered by Bubblez 3 · 0⤊ 0⤋
140
2007-04-03 05:43:34 · answer #5 · answered by dwinbaycity 5 · 0⤊ 0⤋
5 5x1
7 7x1
4 2x2
2x2x5x7=140
2007-04-03 05:43:59 · answer #6 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋