Stage: 4 Challenge Level: 
Find the five distinct digits N, R, I, C and H if:
R N- I +C H = NRICH
Place value. Powers & roots. Mathematical reasoning & proof. Number bases. Properties of numbers. Creating expressions/formulae. Index notation/Indices. Stage 5 - Reviewed 2012. Surds. Modulus arithmetic.
Published September 2002.
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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