help please
2007-10-02 14:57:51 · 5 answers · asked by Lynn W 1 in Science & Mathematics ➔ Mathematics
66 = 2*3*11
78 = 2*3*13
90 = 2*3*15
LCM = 2*3*11*13*15 = 12,870
2007-10-02 15:01:01 · answer #1 · answered by Steve A 7 · 0⤊ 0⤋
2
2007-10-02 22:03:13 · answer #2 · answered by ferdie 2 · 0⤊ 0⤋
12,870
u can know the answer bu using decompesition method..
2 - 66 78 90 (66/2 = 33 ...)
3 - 33 39 45 (33/3 = 11...)
11 13 15
in getting the LCM get the product of 2, 3, 11, 13, and 15
hope you get what i mean
2007-10-02 22:15:10 · answer #3 · answered by lovely 1 · 0⤊ 1⤋
You can find this out through prime factorization (meaning, which primes can be multiplied to get any of these three numbers?).
66 is simply 2 * 3 * 11.
78 is 2 * 3 * 13.
90 is 2 * 3 * 15.
Now, multiply all the prime factors without using a single factor more than once.
2*3*11*13*15
You will get 12,870 for an answer! :-)
2007-10-02 22:05:13 · answer #4 · answered by chexmix30203 1 · 0⤊ 0⤋
66 | 78 | 90 --- 2
33 | 39 | 45 --- 3
11 | 13 | 15 --- 3
11 | 13 | 5 --- 5
11 | 13 | 1 --- 11
1 | 13 | 1 --- 13
1 | 1 | 1
Hence LCM is 2 * 3 * 3 * 5 * 11 * 13 = 12870
2007-10-02 22:02:40 · answer #5 · answered by tancy2411 4 · 0⤊ 0⤋