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ERIC Number: EJ273324
Record Type: CIJE
Publication Date: 1983-Jan
Pages: N/A
Abstractor: N/A
ISBN: N/A
ISSN: N/A
EISSN: 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)
Descriptors: Algebra, Algorithms, Instructional Materials, Mathematical Concepts, Mathematical Enrichment, Mathematics Instruction, Numbers, Proof (Mathematics), Secondary Education, Secondary School Mathematics
Publication Type: Journal Articles; Guides - Classroom - Teacher
Education Level: N/A
Audience: Practitioners
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A