Quick Addition of Three-Digit Numbers and Ones
addition · Mental addition using recomposition to make ten
This mental math practice is a great way of getting your students to think about how they can recombine numbers to get sums quicker.
Quick Addition of Three-Digit Numbers and Ones is a Grade 2 mental-math routine that uses recomposition to make 10. Instead of adding the ones and carrying in the standard way, students break apart the three-digit number so part of it combines with the one-digit addend to create a friendly ten. For example, 585 + 6 can become 581 + 4 + 6.
Use it as a whole-class number talk when students are developing flexible addition strategies. Comparing recomposition with more direct mental methods helps students decide when making 10 is useful and when it is not. Create a free Find a Math Game account to generate teacher-ready lesson support for Quick Addition of Three-Digit Numbers and Ones. No credit card, with 3 lifetime lesson generations.
- Grades:
- 2
- Materials:
- paper, pencil
- Classroom use:
- whole class
Standards alignment
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