How to multiply and divide rational numbers?

To multiply two fractions, you multiply the numbers straight across. The numerators stick together and multiply; the denominators stick together and multiply. For example:

1/2 times 3/4 = (1 times 3)/(2 times 4) = 3/8

After multiplying, we reduce if possible. In this case, we cannot reduce, so we're done with this example.

To divide two fractions, you would flip the second fraction and then multiply straight across. So, for example,

5/7 divided by 7/8 = (5/7) times (8/7) = (5 times 8)/(7 times 7) = 40/49

Notice how the steps are similar as before. The only difference really is that we flipped the second fraction.

i think the length is 12 and the width is 17