2007-04-28 02:02:48 · 16 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Let me show you HOW to find the LCM. Once you get to know your times tables well this become very easy - you eventually can look at the number and just know the answer. Here is in fact what you actually do:
3, 5, and 10 - do the times tables (the Multiples)
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36 ...
5, 10, 15, 20, 25, 30, 35, 40 ...
10, 20, 30, 40, 50 ...
Now check them out and tell me what number is the LOWEST and is COMMON to all three times tables?
Answer is 30 - This is the LCM (lowest common multiple)
Just to let you know - this is a good way to find the LCD - lowest common denominator when adding and subtracting fractions.
2007-04-28 02:13:41 · answer #1 · answered by Critters 7 · 0⤊ 0⤋
LCM = Least Commom Multiples
The multiple of:
3 = 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36 and soon (just add 3 to the previous number
5 = 5, 10, 15, 20, 25, 30, 35, 40 and soon (just add 5 to the previous number)
10 = 10, 20, 30, 40, 50 and soon (just add 10 to the previous number)
By inspection, we can see that 30 is present in all and it is the least (smallest) multiple.
Therefore, the LCM of 3, 5 and 10 is 30
2007-04-28 02:15:27 · answer #2 · answered by detektibgapo 5 · 0⤊ 0⤋
Lcm Of 3 And 5
2016-10-07 06:35:57 · answer #3 · answered by ? 4 · 0⤊ 0⤋
To find the least common multiple you need to break each number down to its prime factorization.
3 and 5 are prime so those are their prime factors respectively. For 10 its prime factors are 2 and 5. For each number you started with take the highest occurence (exponent) of each prime factors and multiply them together.
There is one 3 (3^1), there is one 2 (2^1), and one 5 (5^1). So 3*2*5 = 30.
Lets say we had Find the LCM of 30, 25, and 10.
Prime factors
30 = 2 * 3 *5
25 = 5 * 5 = 5^2
10 = 2 * 5
The highest two is 2^1
The highest 3 is 3^1
The highest 5 is 5^2
So the LCM would be 2^1 * 3^1 * 5^2 = 2*3*25 = 150
2007-04-28 02:52:53 · answer #4 · answered by JDigitalTutoring 2 · 0⤊ 0⤋
This Site Might Help You.
RE:
Find the LCM of the following set of numbers: 3, 5, 10?
2015-08-16 15:37:23 · answer #5 · answered by Anonymous · 0⤊ 0⤋
10 20 30 40-----
5 10 15 20 25 30 35 40------
3 6 9 12 15 18 21 24 27 30 33 ------
LCM = 30
2007-04-28 02:08:01 · answer #6 · answered by Como 7 · 0⤊ 0⤋
30 is the LCM of 3-5-10.
2007-04-28 02:06:00 · answer #7 · answered by Anonymous · 0⤊ 0⤋
30
2007-04-28 02:32:02 · answer #8 · answered by Anonymous · 0⤊ 0⤋
30
2007-04-28 02:23:58 · answer #9 · answered by paladin1988 4 · 0⤊ 0⤋
30
2007-04-28 02:16:20 · answer #10 · answered by Chatterbox 3 · 0⤊ 0⤋