Name at least three major contributions of Islamic mathematicians. Solution 1) . Muhammad Al-Khwarizmi : He had a major role of hindu numerical system 1 - 9 and zero(0) and and created a revolution in islamic mathematics and adopted by complete islamic countries. 2) . Arab Thabit ibn Qurra : Discovered amicable numbers amicable numbers are pairs of numbers for which the sum of the divisors of one number equals the other number, e.g. the proper divisors of 220 are 1, 2, 4, 5, 10, 11, 20, 22, 44, 55 and 110, of which the sum is 284; and the proper divisors of 284 are 1, 2, 4, 71, and 142, of which the sum is 220 3) . Abul Hasan al-Uqlidisi showing the positional use of Arabic numerals, and particularly the use of decimals instead of fractions (e.g. 7.375 insead of 738).