what do the two zero in decimal mathematic
Roman numerals are very difficult to do mathematics with, and do not work at all in advanced mathematics as the roman numeral system has no concept of zero, negative numbers, fractions, powers, or decimals.
The Arabs. Roman mathematics suffered from lack of a zero. They could not do multiplication or division.
Real numbers
Two decimals are equivalent only if everything from the decimal point to the last non-zero digit is the same in both of them. Additional zeros after that don't matter.
In mathematics zero has no size.
The zero symbol and positional place value system of numbers.
Yes
zero
Any negative decimal comes before zero in decimals.
There is no answer. Division by zero is forbidden in mathematics.
Two decimals that are equivalent to 9.50 are 9.5 and 9.50. The decimal 9.5 is equivalent to 9.50 because the trailing zero in 9.50 does not change the value of the number. In both cases, the number represents nine units and five tenths.
The introduction and the understanding of the zero symbol in mathematics.