Judith D. Sally, Northwestern University, Evanston, IL, USAPaul J. Sally, Jr., University of Chicago, Chicago, IL, USA

• To the readerIntroductionNumber systemsDivisibility and order in the integersGCD’s and the division algorithmPrime numbers and factorization into primesApplications of prime power factorizationModular arithmetic and divisibility testsMore modular arithmeticThe arithmetic of fractionsProperties of multiplication of fractionsAddition of fractionsThe decimal expansion of a fractionOrder and the number lineThe mysterious long division algorithmThe pigeonhole principleIndex

Judith D. Sally, Northwestern University, Evanston, IL, USAPaul J. Sally, Jr., University of Chicago, Chicago, IL, USA

• To the readerIntroductionNumber systemsDivisibility and order in the integersGCD’s and the division algorithmPrime numbers and factorization into primesApplications of prime power factorizationModular arithmetic and divisibility testsMore modular arithmeticThe arithmetic of fractionsProperties of multiplication of fractionsAddition of fractionsThe decimal expansion of a fractionOrder and the number lineThe mysterious long division algorithmThe pigeonhole principleIndex

Judith D. Sally, Northwestern University, Evanston, IL, USAPaul J. Sally, Jr., University of Chicago, Chicago, IL, USA

• To the readerIntroductionNumber systemsDivisibility and order in the integersGCD’s and the division algorithmPrime numbers and factorization into primesApplications of prime power factorizationModular arithmetic and divisibility testsMore modular arithmeticThe arithmetic of fractionsProperties of multiplication of fractionsAddition of fractionsThe decimal expansion of a fractionOrder and the number lineThe mysterious long division algorithmThe pigeonhole principleIndex