find the least common factor:
12,18
40,24
36,18
2007-05-21 12:43:08 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
i mean least common multiple
2007-05-21 12:47:01 · update #1
For two numbers there is a simple rule:
The lcm of a, b is the product divided by their gcf
(greatest common factor)
So let's look at each case:
1). 12, 18.
The gcf is 6, so the lcm is 12*18/6 = 12*3 = 36.
2). 40, 24
The gcf is 8, so the lcm is 40*24/8 = 120
3) 36, 18
The gcf is 18 so the lcm is 36.
Hope that helps!
2007-05-21 13:25:17 · answer #1 · answered by steiner1745 7 · 0⤊ 0⤋
12, 18 = 6
40, 24 = 8
36, 18 = 18
Work:
Factor each and then find the factors they have in common and then multiply together:
12 = 2 * 2 * 3 , 18 = 2 * 3 * 3 They both have a one 2 and one 3. Mutiply together 2 and 3 to get 6.
40 = 2 * 2 * 2 * 5, 24 = 2 * 2 * 2 * 3 They both have three 2's in common. Multiplying together 2 and 2 and 2 you get 8.
36 = 2 * 2 * 3 * 3, 18 = 2 * 3 * 3. They both have a 2 and two 3's. Multiplying together 2 and 3 and 3 you get 18.
2007-05-21 12:50:29 · answer #2 · answered by John G™ 3 · 0⤊ 0⤋
12 24 36 48 60 ----
18 36 54 72 ------
LCM = 36
40 80 120 160 -----
24 48 72 96 120 144 -----
LCM = 120
36 72 108-------
18 36 54 72------
LCM = 36
2007-05-21 23:19:23 · answer #3 · answered by Como 7 · 0⤊ 0⤋
http://softmath.com/tutorials/finding-the-least-common-denominator-algebra.html
2007-05-21 13:09:36 · answer #4 · answered by Anonymous · 0⤊ 0⤋