Stage: 1 Challenge Level: 
If you put three beads onto a tens/units abacus you could make the numbers $3$, $30$, $12$ or $21$.
Explore the numbers you can make using six beads.
Investigations. Combinations. Digit cards. Visualising. Working systematically. Place value. Counters. Addition & subtraction. Interactivities. Multiplication & division.
Published June 1999,November 2008,December 2008.
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