(i) Base ten place value to write numbers was developed in India and the Arab World, by 500 A.D.
(ii) Negative coefficient was invented by the Indian mathematician, Brahmagupta, at around 7th Century A.D.
(iv) Zero: It was conceived in Mesopotamia in around 3 B.C.
(v) The equation sign was invented by Robert Recorde in 1557. It was developed in Wales, and it gained recognition in England.