Answer :
Use flashcards! Write the French word for the number on the back, and the numeral form on the front.
Another way is to say it in rhythm, it will help memorize it a bit easier.
Hope this helps!
~GeeksandNerds
1 un
2 deux
3 trois
4 quatre
5 cinq
6 six
7 sept
8 huit
9 neuf
10 dix
20 - 30-40-50-60-70-80-90-
21-22-23-24-25...........
30-31-32-33-34-35-36-37-38-39
10 to 90 you add 1-2-3-4-5-6-7-8-9-
100-101-102-103-104-105-106-107-108-109- 110-111-112-113-114-115-116-117-118-119-
120-121-122-123-124-125-126-127-128-129
130
140
150
160
170
180
190
and you add 1,2,3,4,5,6,7,8,9
learns well units 1,2,3,4,5,6,7,8,9,
then the tens 10,20,30,40,50,60,70,80,90,100
thus : 11,12,13,14,15....
21,22,23,24.....
31,32,33,34,35,36........
then the hundreds 100,200,300,400,500,600,700,800,900
thus:101,102,............
201,202,203....
301,302,303........
2 deux
3 trois
4 quatre
5 cinq
6 six
7 sept
8 huit
9 neuf
10 dix
20 - 30-40-50-60-70-80-90-
21-22-23-24-25...........
30-31-32-33-34-35-36-37-38-39
10 to 90 you add 1-2-3-4-5-6-7-8-9-
100-101-102-103-104-105-106-107-108-109- 110-111-112-113-114-115-116-117-118-119-
120-121-122-123-124-125-126-127-128-129
130
140
150
160
170
180
190
and you add 1,2,3,4,5,6,7,8,9
learns well units 1,2,3,4,5,6,7,8,9,
then the tens 10,20,30,40,50,60,70,80,90,100
thus : 11,12,13,14,15....
21,22,23,24.....
31,32,33,34,35,36........
then the hundreds 100,200,300,400,500,600,700,800,900
thus:101,102,............
201,202,203....
301,302,303........