Within East Timor there are two natural systems with decimal (10) and quintic (5) as basic units. The decimal system is universally understood and transposable to other decimal systems.
Table 5.1. "Decimal System"
| 1 | IDA | |
| 2 | RUA | |
| 3 | TOLU | |
| 4 | HAAT | |
| 5 | LIMA | |
| 6 | NEEN | |
| 7 | NITU | |
| 8 | UALU | |
| 9 | SIA | |
| 10 | SANULU | |
| 11 | SANULU RESIN IDA | |
| 21 | RUANULU RESIN IDA | |
| 100 | ATUS IDA | |
| 246 | ATUS RUA HAATNULU RESIN NEEN | |
| 1000 | RUHAN IDA |
Larger numbers exist, but for practical purposes they are seldom used as most people using larger numbers do so in the Portuguese or Indonesian systems.