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The LCD of two numbers is the smallest number that both multiply into by some other number.
ok. so what would the lcd of 20 be? for example
Find an example in a book. It usually involves two numbers
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LCD is between two or more numbers.
LCD of 5 and 3 is 15, because that is the smalled number both 5 and 3 go into.
ok. i get it now. thanks so much:)
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
\[2^2 \times 3 \times 7^2 = 588\]