Stage: 1 Challenge Level: 
What does 'between' mean?
Should we count the starting and finishing days? Why?
Should we count the starting and finishing days? Why?
Calendars. Addition & subtraction. Speed. Working systematically. Time. Interactivities. Clock. Length/distance. Multiplication & division. Mass and weight.
Published January 2000.
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