# 101Week09-1.pdf - What did we discuss in last class? • We...

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1What did we discuss in last class?We discussed how to convert numerals fromone base to another.We also discussed how to use different bases inthe context of computer mathematics
5.1 Prime and Composite NumbersIdentify prime and composite numbers.Apply divisibility tests for natural numbers.Objectives:Chapter 5: Number TheoryApply the fundamental theorem of arithmetic.2
Number Theoryis the branch of mathematicsdevoted to the study of the properties of thenatural numbers and the integers.Number Theory3Natural numbers are also known ascountingnumbersand thepositive integers.
A counting number isdivisibleby another if theoperation of dividing the first by the second leavesa remainder of 0.Formally: the natural numberaisdivisibleby thenatural numberbif there exists a natural numberksuch thata = bk. Ifbdividesa, then we writeb|a.DivisibilityQuestion: In the above case, isaalso divisible byk?4
If the natural numberais divisible by the naturalnumberb, thenbis afactor(ordivisor) ofa, andais amultipleofb.The number 30 equals 6·5; this product is called afactorizationof 30.2·3·5 is another factorization of 30.5

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Term
Spring
Professor
lamber
Tags
Prime number