#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?

NinjaDevo
Aug 15, 2014

#1**+5 **

**LCD** stands for **L**east **C**ommon **D**enominator.

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.

NinjaDevo
Aug 15, 2014

#2**0 **

NinjaDevo!im still confused!why have they given the question as fractions!why cant they just give the numbers only!?

rosala
Aug 15, 2014

#3**+8 **

Best Answer

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?

NinjaDevo
Aug 15, 2014