Sesikhulumile phambilini mayelana ne izinombolo roman nenzuzo yayo namuhla. Yebo, njengoba wazi, isihloko sibanzi kakhulu futhi kufanele sihloniphe okuthile izinkambiso nemithetho. Izinombolo zamaRoma zisetshenziswa kuphela nge izinhlamvu ezinkulu futhi incwadi ngayinye inikezwa a inani lezinombolo. Lowo kungaba umthetho oyisisekelo, kepha akusiyona yodwa.
Uma uzosebenzisa izinhlamvu zamaRoma, zama ukukwenzela i- izinombolo zezahluko nemiqulu yomsebenzi; yamagama opapa, amakhosi, nababusi, kanye nezingqungquthela, ukuqokwa, ukuhlangana, njll.
Umthetho I : Lapha sizokukhombisa ifayili le- amanani ahambisanayo incwadi ngayinye
Izincwadi: IVXLCDM
Amanani: 1 5 10 50 100 500 1.000
Isibonelo: XVI = 16; I-LXVI = 66; DC = 600 MD = 1,500
Umthetho II : Uma phakathi kwezinombolo ezimbili kukhona elincane, lokhu izokhipha inani layo kokulandelayo.
Izibonelo: XIX = (20 - 1) 19; I-LIV = (55-1) 54; I-CXXIX = (130 - 1) 129
Umthetho III : Khumbula ungalokothi ubeke uhlamvu olufanayo ngaphezu kwezikhathi ezintathu zilandelana. Ezikhathini zasendulo u- "I" noma u- "X" kwesinye isikhathi ubonwa kuze kube izikhathi ezine zilandelana.
Izibonelo: XIII = 13; XIV = 14; I-XXXIII = 33; I-XXXIV = 34
Umthetho IV : Okwe amanani amakhulu kuno-4000, umugqa ovundlile uzobekwa ngaphezulu kophawu, oluzokhombisa ukuthi uphawu luzophindaphindwa ngo-1000. Isibonelo:
• _
• V (5,000)
• _
X (10,000)
• _
L (50,000)
• _
C (100,000)
• _
D (500,000)
• _
• M (1'000,000)
Umthetho v : Kungavunyelwa Izimpawu ezi-2 ezisele kunombolo efanayo inqobo nje uma bengekho ndawonye (Isibonelo CMIX = 909)