2007-11-19 10:12:44 · 19 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
105.
7x15=105
21x5=105
good luck!!
2007-11-19 10:17:50 · answer #1 · answered by Silver Thunderbird 6 · 1⤊ 0⤋
3
2007-11-19 10:15:14 · answer #2 · answered by beatles love 2 · 0⤊ 1⤋
3
2007-11-19 10:15:23 · answer #3 · answered by Anonymous · 0⤊ 2⤋
3
2007-11-19 10:14:23 · answer #4 · answered by nerosbane 3 · 1⤊ 2⤋
3*5*7 =105 3*5=15 3*7=21
2007-11-19 10:17:10 · answer #5 · answered by Franklin 5 · 1⤊ 0⤋
least common multiple it the lowest number into which both of these numbers will go exactly. find it by writing in terms of their prime factors, and taking the highest power of each factor. 15 = 3*5, 21 = 3*7, so lcm = 3*5*7. = 105.
if you wish to check write out the tables for each of 15 and 21.
2007-11-19 10:16:46 · answer #6 · answered by graham e 2 · 1⤊ 0⤋
1
2007-11-19 10:14:37 · answer #7 · answered by Icky 2 · 0⤊ 3⤋
15 = 3 times 5
21 = 3 times 7
so least common multiple is 3 times 7 times 5 equal 105. :]
2007-11-19 10:14:53 · answer #8 · answered by My Lovee 3 · 2⤊ 0⤋
ok, first list what numbers go into each number, then pick the smallest one!
15- 3, 5
21- 3, 7
the least common multiple is 3 not 1, because when the least common multiple of numbers is 1, it means that the numbers are prime.
there you go! the least common multiple is 3
2007-11-19 11:17:51 · answer #9 · answered by justme 3 · 0⤊ 0⤋
The answer is 105.
You can rewrite 15 as 5*3 and you can rewrite 21 as 7*3. If you take one of each number, you get 5*3*7, since there are two 3s, you only take one. 5*3*7 is 105.
2007-11-19 10:15:58 · answer #10 · answered by pyrox92 2 · 1⤊ 0⤋
Least common multiple would be 105.
2007-11-19 10:17:53 · answer #11 · answered by basketballpirate11 2 · 1⤊ 0⤋