Peer reviewed

**ERIC Number:**EJ273324

**Record Type:**CIJE

**Publication Date:**1983-Jan

**Pages:**N/A

**Abstractor:**N/A

**Reference Count:**0

**ISBN:**N/A

**ISSN:**N/A

A Number Trick--Explained with Algebra.

Escultura, Eddie

Mathematics Teacher, v76 n1 p20-21 Jan 1983

The trick focuses on a theorem that the sum of the digits of the difference between any natural number and the sum of its digits is divisible by nine. Two conditions of using the trick are noted. The reason that the theorem works is established through a proof. (MP)

**Publication Type:**Journal Articles; Guides - Classroom - Teacher

**Education Level:**N/A

**Audience:**Practitioners

**Language:**English

**Sponsor:**N/A

**Authoring Institution:**N/A