100s
All real numbers can be represented in the decimal system. Complex numbers can be represented by a pair of numbers in the decimal system.
http://en.wikipedia.org/wiki/List_of_Dewey_Decimal_classes#300_.E2.80.93_Social_sciencesor 301
The library uses the Dewey Decimal Classification system to allocate numbers to books.
The Dewey Decimal System places topics related to religion in the 200s section. This includes books on Christianity, Islam, Judaism, and other world religions. Each religion is assigned a specific range of numbers within the 200s to organize related topics.
Nonfiction books are assigned Dewey Decimal numbers based on their subject matter. This classification system categorizes books into 10 main classes, with each class further divided into subcategories. Librarians use the Dewey Decimal Classification system to assign a unique number to each nonfiction book to help organize them on library shelves.
The decimal number system.
133.5. The 100s deal with Philosophy.
The Decimal System
The Base-10 number system is known as the decimal system and has 10 digits to show all numbers 0,1,2,3,4,5,6,7,8,9 using place value and a decimal point to separate whole numbers from decimal fractions.
In the number system , there are decimal numbers, fractions,rational numbers , irrational numbers , negative and positive numbers.-0.567 on the number system is negative number.
Almost all numbers that we use in daily life are decimal numbers. The place value of each digit is ten times the place value of the digit to its right. And that is all that is required of decimal numbers. A decimal point is not necessary.
-- The decimal system (base-10) uses 10 digits to write all numbers. -- The binary system (base-2) uses 2 digits to write all numbers.