Chat with us, powered by LiveChat ##LCD=90## To find the LCD I like to first do a prime factor | Writedemy

##LCD=90## To find the LCD I like to first do a prime factor

##LCD=90## To find the LCD I like to first do a prime factor

##LCD=90## To find the LCD I like to first do a prime factorizations: ##30=2xx15=2xx3xx5## ##18=2xx9=color(white)(0)2xx3xx3## ##15=color(white)(000000000)3xx5## The LCD will have all the elements that each of the denominators have. First we have 2’s. Both the 30 and the 18 have a 2 so we put in one: ##LCD=2xx?## Next to 3’s. The 18 has two of them and so we put in two: ##LCD=2xx3xx3xx?## Now to 5’s. Both the 30 and the 15 have one so we put in one: ##LCD=2xx3xx3xx5## There are no other primes to include so we can now multiply it out: ##LCD=2xx3xx3xx5=90## So let’s try it out – let’s say we’re doing: ##1/30+1/18+1/15## We want the LCD to be 90: ##1/30(1)+1/18(1)+1/15(1)## ##1/30(3/3)+1/18(5/5)+1/15(6/6)## ##3/90+5/90+6/90=14/90##

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