Search results
Results from the WOW.Com Content Network
Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number. [5] xx 7: xx 8: xx 9: British Indian Ocean Territory +246: 380 7 387 British Virgin Islands +1: 284: 10
The ten digits of the Arabic numerals, in order of value. A numerical digit (often shortened to just digit) or numeral is a single symbol used alone (such as "1"), or in combinations (such as "15"), to represent numbers in positional notation, such as the common base 10.
In European languages, large numbers are read in groups of thousands, and the delimiter—which occurs every three digits when it is used—may be called a "thousands separator". In East Asian cultures , particularly China , Japan , and Korea , large numbers are read in groups of myriads (10 000s) but the delimiter commonly separates every ...
Number systems have progressed from the use of fingers and tally marks, perhaps more than 40,000 years ago, to the use of sets of glyphs able to represent any conceivable number efficiently. The earliest known unambiguous notations for numbers emerged in Mesopotamia about 5000 or 6000 years ago.
Place values are the number of the base raised to the nth power, where n is the number of other digits between a given digit and the radix point. If a given digit is on the left hand side of the radix point (i.e. its value is an integer ) then n is positive or zero; if the digit is on the right hand side of the radix point (i.e., its value is ...
Chinese number gestures count up to 10 but can exhibit some regional differences. In Japan, counting for oneself begins with the palm of one hand open. Like in East Slavic countries, the thumb represents number 1; the little finger is number 5. Digits are folded inwards while counting, starting with the thumb. [7] A closed palm indicates number 5.
300 — the earliest known use of zero as a decimal digit in the Old World is introduced by Indian mathematicians. c. 400 — the Bakhshali manuscript uses numerals with a place-value system, using a dot as a place holder for zero . 550 — Hindu mathematicians give zero a numeral representation in the positional notation Indian numeral system.
Patterns can be seen in the last digits of the Mersenne primes and corresponding perfect numbers above, but they are simple properties of the odd-numbered Mersenne numbers and do not depend on their primality. Multiplying by 2 generates a cycle of length 4 modulo 5 (1, 2, 4, 3, repeat). Thus, 2 4k ±1 ≡ ±2 (mod 5).