Ask family to quiz you on your multiplication tables. Once you have studied them enough to know them well, ask your family to quiz you on the tables you have just learned. This will help you remember them long term and keep the numbers fresh in your head. When you have all the tables memorized, ask them to quiz you on all of the numbers, not just one number at a time.
Long Division. There are different methods for dividing multi-digit numbers (long division). One way is a combination of estimation/ trial and error and multiplication. There is also a commonly used algorithmic method that is well explained and illustrated here at mathisfun.com.