# Understanding numbers

In this section, we will look at the following topics:

**The decimal number system and place value (whole numbers)** – explaining the numbers system/Hindu-Arabic numerals, face, place and total value, expanded notation, reading/writing numerals/grouping digits for ease of reading/writing

**The Decimal Number System and Place Value (Decimal Numbers)** – revising the number system/Hindu-Arabic numerals, face, place and total value, expanded notation, reading/writing numerals/grouping digits for ease of reading/writing

**Types of Numbers** – nominal/cardinal numbers, positive/negative numbers, integers/whole numbers, rational/irrational numbers, prime/composite numbers, factors/multiples, square/triangular numbers