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Numbers originated as a means of counting and recording items. The numbers 0 to 9 are commonly referred to as the Hindu-Arabic numeral system. Simple counting systems with symbols to represent 1 to 9 are very ancient, in terms of hundreds of years BC. The need to include a zero as an essential digit is credited to the Indian mathematician, Brahmagupta (598 -668 AD). His contribution to the advancement of mathematics and astronomy is quite incredible, and I have included a link that references several books on the history of ancient mathematics. I have also included a link showing how the symbols of 0 to 9 have changed over the years.
Switch the two numbers round then take away the smaller number from the bigger one: 67-76 76- 67= 09 09-90 90- 09= 81 etc
The first counting numbers are 1-10. You counted fingers and toes and other body parts.
Not any more than other numbers.
.65>.09 0.65, because if you took the decimal away and all numbers to the right of it, you'd be left with 09 and 65. Well, which one is greater now? ;)
Pythagoras studied odd and even numbers, triangular numbers, and perfect numbers. Pythagoreans contributed to our understanding of angles, triangles, areas, proportion, polygons, and polyhedra