The letters of the word ABACUS have been arranged in the shape of a
triangle. How many different ways can you find to read the word
ABACUS from this triangular pattern?
Stage: 3 and 4 Challenge Level:
Rosie and Zoe solved this Sudoku, their journey can be found here.
The order with which they filled the Sudoku is marked in the boxes.
This is one possible method of many to help you solve the
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the
NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to
embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities
can be found here.