im working on a fraction problem and need to find the lcd for the numbers 7,9,13 ive been working on it for a while and finally give up anyone have ne clue??
2006-08-17 10:36:10 · 11 answers · asked by b308camie 1 in Education & Reference ➔ Homework Help
ok my lil problem is
67 3/7
+
3 12/13
+
20 5/9
=????
see what i mean? maybe i just dont see it ugh i hate math!
2006-08-17 10:46:00 · update #1
Thanks everyone!!! u guys are the bestest! I got it! wooo! thank you all so much!:)
2006-08-17 10:52:02 · update #2
They're whole numbers? They all have a denominator of 1. Unless you mean 1/7+1/9+1/13. Then you need to find the lowest common multiple of 7, 9 and 13. And since 7 and 13 are primes, then LCM of 7 and 13 = 7*13 = 91. 91 and 9 are relatively prime, which means they don't share any common factors, so LCM of 9 and 91 = 9*91 = 819.
1/7+1/9+1/13 = [(13*9)+(13*7)+(7*9)]/819 = 271/819
2006-08-17 10:45:09 · answer #1 · answered by Anonymous · 1⤊ 0⤋
1
2006-08-17 17:41:21 · answer #2 · answered by Timmy K 2 · 2⤊ 0⤋
7 & 13 are prime #'s they can not be divided by anythig but 1 and itself. You may have to ask your actual fraction problem to get the answer you need, For 9 the answer would be 2 I believe. The # 1 is not actually a prime # so i would then say your answer would be 7 & 13
2006-08-17 17:46:04 · answer #3 · answered by Jess 2 · 0⤊ 1⤋
It isn't 1---multiply the three numbers times each other: 7 x 9 x 13 and that's the answer. It's 819
2006-08-17 17:45:10 · answer #4 · answered by Sunshine Girl 1 · 0⤊ 1⤋
The factor of the numbers 7,9,13 are as follows:7: 1,7 :9: 1,3,9 :13: 1,13 So the LCD Would be 1
2006-08-17 17:45:35 · answer #5 · answered by CeCi 3 · 1⤊ 0⤋
7, 9, and 13 in fraction form are:
7/1, 9/1, 13/1
So the LCD would be 1
I'm actually an English major so someone may have to back me up on that one to be sure. ;)
2006-08-17 17:44:46 · answer #6 · answered by Jessica 2 · 2⤊ 0⤋
7*9*13 = do the math
2006-08-17 17:43:00 · answer #7 · answered by rk 2 · 0⤊ 1⤋
It's one. 7 and 13 are prime numbers.
2006-08-17 17:42:27 · answer #8 · answered by tonevault 3 · 2⤊ 0⤋
prime numbers have nothing else in common except 1 so that would be your common denominator.
2006-08-17 17:45:37 · answer #9 · answered by BeC 4 · 1⤊ 0⤋
819
These are all prime numbers so you have to multiply them.
2006-08-17 17:46:35 · answer #10 · answered by teacherbrandi 1 · 0⤊ 0⤋