anonymous
  • anonymous
I need help to find the lcm of 12, 28, it is taking to long and i never get the right answer!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
Becca 12 written as prime numbers is 2 * 2 * 3 do you understand this?
anonymous
  • anonymous
28 is 2 * 2 * 7
anonymous
  • anonymous
Uhhh not really....

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anonymous
  • anonymous
How about this... 12 is 4 * 3 28 is 4 * 7
anonymous
  • anonymous
The LCM of 12 and 28 is 84.
anonymous
  • anonymous
Yea :V
anonymous
  • anonymous
I get that blexing
anonymous
  • anonymous
OK.. they both have a 4 so you only use it once. You multiply all the things they have in common (4) times all the things they don't have in common (3 and 7) SO... 4 * 3 * 7 = 84
anonymous
  • anonymous
Mhmm........... Why would you multiply 3 and 7 even though they dont have them in common? I am so difficult :( I don't understand anything....
anonymous
  • anonymous
You are ok... it is just the way you find the lcm. Do you have another one, I will help you.
anonymous
  • anonymous
Yea 12 & 19 90*
anonymous
  • anonymous
What is the 90* 12 = 3 * 4 19 = 1 * 19 so it is just 1 * 3 * 4 * 19 nothing in common which means it is actually 12*19
anonymous
  • anonymous
I meant 90 not 19 lol
anonymous
  • anonymous
I wasnt looking when i was typing
anonymous
  • anonymous
OK 12 = 2 * 2 * 3 (4 times 3) 90 = 2 * 5 * 9 (2 times 45 and 45 is 5 times 9) Do you get this?
anonymous
  • anonymous
Yea I understand a llittle...... Im struggling in math so I hope i'm not bothering.....
anonymous
  • anonymous
OR 12 = 2 * 6 12 = 2 * 2 * 3 (I replaced the 6 with 2 * 3) 90 = 2 * 45 90 = 2 * 5 * 9 (I replaced the 45 with 5 * 9) 90 = 2 * 5 * 3 * 3 (I replaced the 9 with 3 * 3) This is how it should look.. I forgot to break down the 9 in my last post
anonymous
  • anonymous
Oh now get it better!
anonymous
  • anonymous
12 = 2 * 2 * 3 90 = 2 * 5 * 3 * 3 What do they both have....... answer (2 and a 3) So you multiply 2 * 3 (what they have in common) and then everything else 2 * 3 (common) * 2 * 5 * 3 (not common) 180
anonymous
  • anonymous
Oh okay I get that
anonymous
  • anonymous
Thx
anonymous
  • anonymous
Anymore?
anonymous
  • anonymous
Uhh 28, 42
anonymous
  • anonymous
28x3=84 42x2=84. Your LCM is 84!

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