How to Count in Arabic

Using Arabic for numbers and counting can be a bit tricky if you need to work extensively with numbers, such as in mathematics and accounting. Arabic number can be confusing because the rules change depending on how the numbers are being used.

To make things easier, take a look look at just the most common usage — without worrying about the more advanced rules for case and gender. Even native speakers often default to a simplified form for numbers, except in the most formal situations.

The numbers you'll use the most often are those between 1 and 20.

1 to 20

waaHid	1
Ithnaan	2
Thalaatha	3
arba'a	4
Khamsa	5
Sitta	6
sab'a	7
Thamaaniya	8
tis'a	9
'ashara	10
aHad 'ashar	11
ithnaa 'ashar	12
thalaathat 'ashar	13
arba'at 'ashar	14
khamsat 'ashar	15
sittat 'ashar	16
sab'at 'ashar	17
thamaaniyat 'ashar	18
tis'at 'ashar	19
'ishriin	20

The numbers from 21 to 99 are formed by saying the ones digit first, then wa (and) followed by the tens digit. For example, waHid wa 'ashriin (21 [literally: one and twenty]).

21 to 99

waHid wa 'ishriin	21
ithnaan wa 'ishriin	22
thalaathiin	30
waHid wa thalaathiin	31
ithnaan wa thalaathiin	32
arba'iin	40
khamsiin	50
sittiin	60
sab'iin	70
thamaaniin	80
tis'iin	90

You should read Arabic numbers in the same order as English numbers, from the largest to smallest place, except for the ones digit, which comes before the tens. So 1964 would be read “one thousand, nine hundred, four, and sixty” or alf tis'a mi'a arba' wa sittiin.

100 and higher

mi'a	100
mi'a wa waHid	101
mi'a wa 'ashara	110
mi'a wa khamsa wa khamsiin	155
mi'ataan	200
thalaath mi'a	300
arba' mi'a	400
khamsu mi'a	500
sitta mi'a	600
sab'a mi'a	700
thamaanii mi'a	800
tis'a mi'a	900
alf	1,000

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Source:http://www.dummies.com/how-to/content/how-to-count-in-arabic.html