In the ten's place, 0 is less than 1, so the 0 is increased by 10, and the difference with 1, which is 9, is written down in the ten's place.
Dǎɣ edag wan təmirwen, 0 ogar təmidrit dǎɣ 1. Nisawaɗ adiš dǎɣ 0 əd 10, əd nikatab ƭəbidawen dər 1, eqalan 9, dǎɣ edag wan təmirwen.