Positive and Negative Numbers  
Summary 
at this level the three sets of numbers you have to be familiar with are the sets of natural numbers, whole numbers and integers.
integers are the set of whole numbers which includes the negatives, the positives and zero. numbers can be shown as sets or on number lines. integers can be added, subtracted, multiplied and divided. 
Key Skills 
show numbers from the set of integers on a number line. do calculations with integers:

Vocabulary 
integers, irrational numbers, rational number, natural numbers, real numbers, universal set, whole numbers. 