What is the common denominator of 9&16?

Question

trying to find 8/9 x 15/16?

and yes,then 8x15..thanks

Answer 1

You don't need a common denominator to multiply fractions. You only need a common denominator if you're adding or subtracting fractions. The easiest way to do the problem you presented is to cancel common factors (cancel 8 from the 8 and 16, and cancel the 3 from the 9 and 15);

8/9 x 15/16 = 1/3 x 5/2 = 5/6

If you really want to know the common denominator, the first answerer is correct (it's 144), but it's not helpful in solving the problem.

Answer 2

It is 144. If you ever do not know and just need some denominator just multiply each by the other's denominator. The fraction with 9 on the bottom by 16 and the fraction with 16 on the bottom by 9. This time doing that gives you the lowest common denominator.

Answer 3

You'll have to settle for 9 times 16 or 144, because 9 and 16 have no common factors.

LCM (x,y) = xy / GCD (x,y)

where GCD (x,y) is the greatest common divisor of x and y, 1 in the case that x=9 and y = 16


Oh, and 72 is not going to work, despite what the comment following me says.

72=8*9

is not divisible by 16, because 9 is odd.

Answer 4

9=3x3
16=2x2x2x2
2x2x2x2x3x3=144 is the common denominator

Answer 5

9=3X3
16=2x2x2x2
no common denominator
However
8x15 / 9X16 =2x2x2x3x5 / 3x3x2x2x2x2
cancel tripple 2x2x2 in numerator and denominator
also cancel a 3 in numerator and denominator

=5 / 3x2 = 5/6

Answer 6

an easy trick is to multiply the two denominators by eachother to find a quick common denominator. This isn't nessecarily the lowest common denominator though.

Answer 7

To find the LCD, multiply 9 times 16.

9 x 16 = 144 is the COMMON DENOMINATOR.

Can you take it from here?

Guido

Answer 8

there's none but easiest way to do this is :
8=2x4...15=3X5....9=3x3&16=4x4so youll have
2x4x3x5/3x3x4x4....which is..2x5/3x4=10/12=5/6=0.833333

Answer 9

try 72