Use knowledge of factors to help with multiplying and dividing larger numbers: quite difficult concepts.

Continue to work with square numbers up to 20 squared. Try to learn all these. Square roots.

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.