Multidigit +/- (Composing Numbers)

Uses composition of tens and all previous strategies to solve multidigit +/- problems. 


You may see this:

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Other Examples:


  • When asked, "What's 37 - 18?," the child says, "I take 1 ten off the 3 tens; that's 2 tens. I take 7 off the 7. That's 2 tens and zero...20. I have one more to take off. That's 19."  
  • When asked, "What's 28 + 35?" a child thinks, 30 + 35 would be 65. But it's 28, so it's 2 less: 63." 

Help your student become a(n) Multidigit +/- (Composing Numbers)

Activities continue to challenge children to fluently and flexibly add and subtract multidigit numbers mentally or using written numbers or other inscriptions (e.g., empty number line).

Make Me 100

Jumping to 100

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.