Let's start with the numerals we need to build French numbers: 0 - ZÉRO. 1 - UN. 2 - DEUX. 3 - TROIS. ... 10 - DIX. 11 - ONZE. 12 - DOUZE. 13 - TREIZE. ... 20 - VINGT. 30 - TRENTE. 40 - QUARANTE. 50 - CINQUANTE. ... 20 - VINGT. 21 - VINGT-ET-UN (Add 'et' between the ten and the unit but for this one only) 22 - VINGT-DEUX. 23 - VINGT-TROIS.