because the switches were hard-wired together and fairly hard to re-wire telephone exchange buildings in many larger cities in north America were dedicated circuits that begin with the first two or three digits of the standard 7 to the phone numbers .
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When dealing with base 16 (a/k/a "hexidecimal"), when counting upwards, when a digit goes to 16 it creates a new digit to the left. Examples of base 16 usage: 08 09 0A 0B 0C 0D 0E 0F 10 or 0FC 0FD 0FE 0FF 100 Base 10 means that when counting upwards, when a digit goes to ten it creates a new digit to the left. Examples of base 10 usage: 08 09 10 or 098 099 100 If you were dealing with base 2 (a/k/a "binary"), when counting upwards, when a digit goes to 2 it creates a new digit to the left. Examples of base 2 usage: 00 01 10 or 010 011 100
In the US usage, it is 1,000,000,000,000. In the traditional British usage, it is 1,000,000,000,000,000,000. Despite the name, you can't always count on the British to use the traditional British usage. In the rest of the world, it might be one or the other.
In todays modern usage of Roman numerals MCMXXVII represents 1927 But the ancient Romans would have wrote them out quite differently
If you mean: MCMLXXXI then in today's usage of Roman numerals they represent 1981 but the ancient Romans probably wrote then out quite differently.
Natural numbers are the numbers used to count things 1, 2, 3, 4.... Etc. There is some debate if zero should be included with the natural numbers. They are also used to order things first, second, third etc. "The box contains 20 apples" would be an example of natural number usage.