What number can you multiply both 9 and 7 to equal the same number?

Question

I need to find the LCD from the denominators 9 and 7 but I don't know how to find it

Answer 1

Cindy,

Your first question answer is zero, since 9*0 = 0 and 7*0 = 0.

Your second question asks for the LCD for denominators of 9 and 7.

A common denominator can always be the product of the two denominators, so 9*7 = 63 is a common denominator.

Since one of the denominators is prime, there is no lower common denominator, so the answer is 63.

Answer 2

Hi Cindy,

 

For LCD between 9 & 7 is 9 x 7 = 63.  It is because 7 is prime number that has only two factors: 1 and itself.  Number like 9 has factors of (1, 3, 9).  So, in this case, all you have to do is multiply both numbers to find/get LCD.

 

If you will happen to find LCD between prime numbers, all you have to do is multiply them because 1 is only number that all numbers share.

 

 

Good luck.