Lesson objective: Add numbers within 1000 by decomposing values to make regrouping easier.
This work develops students' understanding that the order of addends when adding will not affect the sum.
Students engage in Mathematical Practice 7 (Look for and make use of structure) as they use place value to decompose values into smaller amounts that can be used to make addition of numbers more efficient.
Key vocabulary:
- addends
- decompose
- sum
Special materials needed:
- base ten blocks