Reminder: the factors of a number are those numbers that divide exactly into it, without leaving a remainder. A number which only has factors of 1 and itself is called a prime number.

More on square and cube numbers. You may have noticed that cube numbers start getting pretty big, pretty quickly.

The prime factors of a number are the factors which are also prime numbers. They can be found by using a factor tree.

Using the standard written method to multiply 2-digit numbers.