2007-04-27 17:13:54 · 10 answers · asked by stantx5 1 in Science & Mathematics ➔ Mathematics
The answer is 120...
2007-04-29 03:32:02 · answer #1 · answered by Anonymous · 0⤊ 0⤋
The Least Common Multiple is the Number for which a Given pair (or more) of Numbers are Factors
In your example you are being asked to find the lowest number into which 8 , 15 and 20 are all divisble with NO REMAINDER
This can be done by Multiplying 8 x 15 x 20 = 2400
Then by Inspection Decide if this can be Reduced and still be True
2400 / 20 = 120 ( which is 8 x 15 and 15 x 8 and 20 x 3)
Therefore 120 IS the Least Common Multiple of 8 ,15 & 20.
2007-04-28 02:52:39 · answer #2 · answered by Rod Mac 5 · 0⤊ 0⤋
It is 120.
And you mean Lowest Common Multiple. (Or at least that's what they call it in the UK). This is the smallest number that has factors of 8, 15 and 20.
As 8 and 15 are coprime, 8 x 15 =120. 20 shares factors with 8 and 15 you don't need to count it.
2007-04-28 02:51:10 · answer #3 · answered by ArchieBabes 2 · 0⤊ 0⤋
20 40 60 80 100 120 140 etc
15 30 45 60 75 90 105 120 135 150 etc
8 16 32 48 56 64 72 80 88 96 104 112 120 etc
From above, L.C.M. = 120
2007-04-27 20:15:53 · answer #4 · answered by Como 7 · 0⤊ 0⤋
120. Since 8 and 15 have no common factor, the LCM must be some multiple of their product, which is 120. Since 120 is a multiple of 20, the answer is 120.
2007-04-27 17:15:49 · answer #5 · answered by Anonymous · 3⤊ 0⤋
8, 15, 20 div by 2
4, 15, 10 div by 2
2, 15, 5 div by 2
1, 15, 5 div by 3
1, 5, 5 div by 5
1, 1, 1
Hence 2x2x2x3x5 = 120
So the Lowest Common Multiple is 120.
2007-04-28 16:23:41 · answer #6 · answered by Kemmy 6 · 0⤊ 0⤋
15
2007-04-27 17:16:22 · answer #7 · answered by Faisal R 3 · 0⤊ 2⤋
factorise:
2 x 2 x 2
3 x 5
2 x 2 x 5
then cancel out:
2 x 2 x 2 x 3 x 5 = 120
2007-04-27 19:10:15 · answer #8 · answered by Tropic-of-Cancer 5 · 0⤊ 0⤋
120
2007-04-27 17:16:28 · answer #9 · answered by Anonymous · 0⤊ 0⤋
http://www.dreamwork.dk/whocares2.jpg
2007-04-27 17:15:52 · answer #10 · answered by tbear 5 · 0⤊ 0⤋