Decade Spin [Composing Numbers]

Activity Type: Whole Group
Deriver +/- (Composing Numbers)

Quick Description:

Present problems such as 70 + 3 and 20 + 7. Use the same strategy as above, placing 2 tens and then 7 ones out. If students need additional assistance, lay the ones out one at a time while counting by ones. Note the result (“27 … that means 2 tens and 7 ones”) and encourage students to solve another one faster way.

Special Thanks To

Institute of Education Sciences
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.