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# what is the lcd for 5/9 and 2/3

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what is the lcd for 5/9 and 2/3

Aug 15, 2014

#3
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Well, the top number wasn't really all that important for this question, but it shows that these numbers are fractions.

Becasue the top number in a fraction is the numerator and the bottom number is the denominator. Fining the LCD of two fractions can be usefull when you want to add or subtract the two fractions, but they don't have a common denominator.

If we wanted to just find the lowest common multiple of two non-fraction numbers, we would find the Lowest Common Multiple, or the LCM.

Does that make sense rosala?

Aug 15, 2014

#1
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LCD stands for Least Common Denominator.

Here we want to find the lowest multiple of each of the denominators (bottom numbers of the fractions)

We have 5/9 and 2/3. Here are 9 and 3 multiples:

9, 18, 27, 36...etc

3, 6, 9, 12, 15, 18...etc.

Which number is the lowest but on on both lists? It looks like 9:

9, 18, 27, 36...etc

3, 6, 9, 12, 15, 18...etc.

So 9 is the LCD.

Aug 15, 2014
#2
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NinjaDevo!im still confused!why have they given the question as fractions!why cant they just give the numbers only!? Aug 15, 2014
#3
+8

Well, the top number wasn't really all that important for this question, but it shows that these numbers are fractions.

Becasue the top number in a fraction is the numerator and the bottom number is the denominator. Fining the LCD of two fractions can be usefull when you want to add or subtract the two fractions, but they don't have a common denominator.

If we wanted to just find the lowest common multiple of two non-fraction numbers, we would find the Lowest Common Multiple, or the LCM.

Does that make sense rosala?

#4
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Ok!so thats the main use of LCD!

i had learnt this in 6th standard and now i was wondering what lcd was when i saw that question!thanks for telling me NinjaDevo!Thumbs up! Aug 15, 2014
#5
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No problem. Glad to help. :)

Aug 15, 2014