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Ghiyath al-Din Tughluq died in 1325.
Ghiyath ad-Din Mas'ud died in 1152.
No, Archimedes is not credited with the discovery of decimals. In fact, Jamish Al-Kashi is credited with the discovery of decimals.
Kashi coupons are usually found on the inside of the box of kashi cereal.
Kashi - company - was created in 1984.