Great app for learning original Arabic numerals. All this works in a playful way. You are given two options to explore. First, you need to draw Arabic numerals yourself. Second, it is necessary to write the equivalent of modern Arabic numerals to the original ones.
And also here is some information on the original Arabic numerals.
Some official informations:
Origin of the Arabic numeral symbols
According to Al-Beruni, there were multiple forms of numerals in use in India, and “Arabs chose among them what appeared to them most useful”[citation needed]. Al-Nasawi wrote in the early eleventh century that the mathematicians had not agreed on the form of numerals, but most of them had agreed to train themselves with the forms now known as Eastern Arabic numerals. The oldest specimens of the written numerals available from Egypt in 873–874 show three forms of the numeral “2” and two forms of the numeral “3”, and these variations indicate the divergence between what later became known as the Eastern Arabic numerals and the (Western) Arabic numerals.
Calculations were originally performed using a dust board (takht, Latin: tabula) which involved writing symbols with a stylus and erasing them as part of calculations. Al-Uqlidisi then invented a system of calculations with ink and paper “without board and erasing” (bi-ghayr takht wa-lā maḥw bal bi-dawāt wa-qirṭās). The use of the dust board appears to have introduced a divergence in terminology as well: whereas the Hindu reckoning was called ḥisāb al-hindī in the east, it was called ḥisāb al-ghubār in the west (literally, “calculation with dust”). The numerals themselves were referred to in the west as ashkāl al‐ghubār (dust figures, in Ibn al-Yāsamin) or qalam al-ghubår (dust letters).
The western Arabic variants of the symbols came to be used in Maghreb and Al-Andalus, which are the direct ancestor of the modern “Arabic numerals” used throughout the world. The divergence in the terminology has led some scholars to propose that the Western Arabic numerals had a separate origin in the so-called “ghubār numerals” but the available evidence indicates no separate origin. Woepecke has also proposed that the Western Arabic numerals were already in use in Spain before the arrival of the Moors, purportedly received via Alexandria, but this theory is not accepted by scholars.
Some popular myths have argued that the original forms of these symbols indicated their numeric value through the number of angles they contained, but no evidence exists of any such origin.