Write any amount in Arabic and English words for cheques, invoices, receipts and contracts. The Arabic follows the wording used on Gulf cheques, including the subunit (halalas, fils, baisa) and "فقط … لا غير".
Words are much harder to alter than digits. On cheques, banks usually rely on the written amount if the two disagree.
Yes. Numbers agree with the currency's gender, 3 to 10 take the plural (ثلاثة ريالات), 11 to 99 take the singular (أحد عشر ريالاً), and forms such as مائتا ريال are handled.
Saudi riyal, UAE dirham, Kuwaiti dinar, Qatari riyal, Bahraini dinar, Omani rial, Egyptian pound, Jordanian dinar and US dollar, plus plain numbers.
Up to 999 billion, with 2 or 3 decimal places depending on the currency.