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## anonymous 5 years ago i have not done LCD for 7 years. im still reading about it and i still dont get it. can some one help me?

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1. anonymous

The LCD of two numbers is the smallest number that both multiply into by some other number.

2. anonymous

ok. so what would the lcd of 20 be? for example

3. anonymous

Find an example in a book. It usually involves two numbers

4. anonymous

LCD is between two or more numbers.

5. anonymous

LCD of 5 and 3 is 15, because that is the smalled number both 5 and 3 go into.

6. anonymous

ok. i get it now. thanks so much:)

7. anonymous

here is how you find it for big numbers: factor each number into prime factors, then take each prime to the highest power you see in any one number. 5 and 3 are both primes, so just multiply. but for say 8 and 12 you would write $8=2^3$ $12=2^2\times 3$ so least common multiple is $2^3\times 3 = 24$ of course you might have just seen the 24, but for 84 and 98 you would probably not see the answer. $84=2^2\times 3 \times 7$ $98=2 \times 7^2$ least common multiple is $2^2 \times 3 \times 7^2 = 588$

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