a) This could be a special numbering system, such as the Dewey Decimal System used in libraries. Such as 620.105.3.1.
b) Or do you refer to repeating decimals, such as 6.304 304 304.
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3 periods
3 ones as decimal: 3 ones = 3 and it is a whole number = 3.0 in decimal
The decimal number midway between 3 and 4 is 3.5
A period is a group of 3 digits in a number. For example: 6,756,215,985,000,000 .this number has 5 periods, because every group of 3 digits counts as a period. Another example: 214,587,425. this number has 3 periods. another example: 12. this number has 0 periods. another example: 54,554,215,487,256,542,154,252,563,253,256,896,585,487,545,468. (this number has 15 periods.) well...I hope I helped! :)
3/4 = 0.75 a terminating decimal