Span Decades [Composing Numbers]
Activity Type: Whole Group
Problem Solver +/- (Composing Numbers)
Present problems that bridge decades, such as 77 + 3 and 25 + 7. As above, use manipulatives and modeling as necessary, until children can solve this mentally, or with drawings such as the empty number line.
Special Thanks To
The research reported here was supported by the Institute of Education Sciences, U.S. Department of Education, through grant numbers R305K050157, R305A120813, R305A110188, and R305A150243. to the University of Denver. The opinions expressed are those of the authors and do not represent views of the Institute or the U.S. Department of Education.