5th Grade · Operations & Algebraic Thinking
Brackets
5.OA.A.1
Definition
Grouping symbols [ ] used to group expressions, often around parentheses.
Examples
- 2 x [(3 + 4) x 5] = 2 x [7 x 5] = 2 x 35 = 70.
- [10 - (2 + 3)] x 2 = [10 - 5] x 2 = 10.
Key rule
Work from the innermost group outward.
Memory hook
Brackets hug the parentheses — work inside out.