lcm???????????

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12 20 35

2007-08-21 15:05:19 · 4 answers · asked by rudyspuddin 4 in Science & Mathematics ➔ Mathematics

4 answers

420.

2007-08-21 15:09:19 · answer #1 · answered by Anonymous · 0⤊ 0⤋

12 = 2 x 2 x 3
20 = 2 x 2 x 5
35 = 3 x 7

LCM: 2 x 2 x 3 x 5 x 7 = 420

2007-08-21 15:10:51 · answer #2 · answered by 7 · 0⤊ 0⤋

Do them 2 at a time, using the fact that
LCM(a,b) = ab/GCD(a,b).
So LCM(12.20) = 12*20/4 = 60.
LCM(60,35) = 60*35/5 = 60*7 = 420.

2007-08-21 15:30:36 · answer #3 · answered by steiner1745 7 · 0⤊ 0⤋

12=2x2x3
20=2x2x5
35=5x7

The lcm can be found by taking the most times a factor is found in one of the numbers. 2 twice, 3 once, 5 once, 7 once.
Multiply those numbers 2x2x3x5x7=420

This will help you find common denominators to solve fractions.

2007-08-21 15:15:39 · answer #4 · answered by Ed S 4 · 0⤊ 0⤋