I think I had a hard time on 3-2 when we had to multiplye decimales. I figures that I was not putting the decimal in the right spot. Then my mom explaned to me that all you have to do is just count the number of numbers behind the decimal and you would start behind the number you got after you did the problom and go left and count where the decimal would go.

Example:

2.11 x 43 = 9,073

so  then there would be 2 behind the decimal so it would be 90.73

Bob earns 8.28 dollars a day he wants to know how much he gets a week?

8.28 x 7 = 5,796

There is 2 numbers behind the decimal so it would be 50.96