Question

How to cross cancel fractions for example 3/5 •15/18

Answer 1

Here is how you cross cancel these fractions:
$\frac{3}{5} * \frac{15}{18}$
We can start by observing that 18 is a multiple of 3, and it is obtained by multiplying 3 by 6.
So... We can cross out 3 and put a 1 in its place, and we can do the same for 18 but instead by putting a 6 in its place.
This is what we have now:
$\frac{1}{5} * \frac{15}{6}$
However, we are not done yet, we can see that 15 is a multiple of 5, which can be obtained by multiplying 5 by 3.
Therefore... We can cross out 5 and put a 1 in its place, and we can cross out 15 and put a 3 in its place. This is what we have now:
$\frac{1}{1} * 3/6$
Now, we can simplify the expression above to get 1/2, or 0.5 in decimal form. Hope this helps and have a nice day!

Answer 2

You would do 15 divided by 5 equals 3, and 5 divided by 5 equals 1, so it would turn into 3/1 times 3/18. Then,18 divided by 3 equals 6, and 3 divided by 3 equals 1, so the final answer would be 1/1 times 3/6, which equals 1/2 or 3/6.