Decimal numbers

There are different types of decimal numbers:

- Exact decimals or regular numbers: they are the ones which don’t go on forever, so you can write down all their digits. For example: 0,125

- Repeating or recurring decimals: They are decimal numbers which at some point become periodic (repeated over and over). For example: 0,125252525252525... is a recurring decimal, where '25' is repeated forever. The group of repeated decimal digits is called period. There are two types:

        - Pure periodic decimals: 3,1212121212…

        - Eventually periodic decimals: 4,0312222222….

 

Exercise. Classify these numbers:

a) 1.234234234...

b) 12.23235709

c) 12.112121212...

d) 1.234567891011...

 

 

 

 

Solutions: a) pure peridoic decimal; b) exact decimal; c) eventually periodic decimal; d) non recurring decimal