Stage: 4 Challenge Level: 
Find the five distinct digits N, R, I, C and H if:
R N - I +C H = NRICH
Surds. Creating expressions/formulae. Properties of numbers. Place value. Number bases. Powers & roots. Index notation/Indices. Mathematical reasoning & proof. Manipulating algebraic expressions/formulae. Modulus arithmetic.
Published September 2002.
Copyright © 2007. University of Cambridge. All rights reserved.
NRICH is part of the family of activities in the Millennium Mathematics Project, which also includes the Plus and Motivate sites.
email: nrich@damtp.cam.ac.uk
