Oh yeah, a trick for multiplying them is: 1. Find the greater number. (In 5! * 4!, it would be 5.) 2. Write the other number down as if you were doing a factorial. (In 5! * 4!, you would write down 4*3*2*1) 3. Write the greater number down the same way. (In 5! * 4!, you would write 5*4*3*2*1.) 4. Use exponents to combine the two equations. (In 5! * 4!, you would write 5 * 4 squared * 3 squared * 2 squared * 1 squared.
