Numerical digit
From India, the thriving trade between Islamic sultans and Africa carried the concept to Cairo. Arabic mathematicians extended the system to include decimal fractions, and Muḥammad ibn Mūsā al-Ḵwārizmī wrote an important work about it in the 9th  century. The modern Arabic numerals were introduced to Europe with the translation of this work in the 12th century in Spain and Leonardo of Pisa's "Liber Abaci" of 1201. In Europe, the complete Indian system with the zero was derived from the Arabs in the 12th century.
Spread of the Latin script
The Scramble for Africa (1881–1914), meaning the rapid occupation, colonisation and annexation of inland Africa by European powers, went hand in hand with the spread of literacy amongst native Africans, as the Latin script was introduced where there were other writing systems or none. Until the early 19th century, the Berber peoples in North Africa had two systems: originally Tifinagh, and, following the spread of Islam, the Arabic script as well. French colonists, particularly missionaries and army linguists, developed a Berber Latin alphabet to make communication easier, especially for the Kabyle people in French Algeria. Since no great body of Berber literature existed, and the colonisers greatly helped improve literacy rates, the romanisation received much support, more so after Algerian independence (1962) when the French-educated Kabyle intelligentsia began to stimulate the transition and especially since the establishment of a standard transcription for Kabylie in 1970. Similar French attempts to latinise the Arabic language met much more resistance, were unsuccessful and eventually abandoned.