# CCSS.3.NBT.A.2

addition, subtraction, within 1000, algorithms; calculate, fluently compute, explain.

System: US Common Core Math
Route: /math/standards/us-ccss/curratom-us-ccss-3-nbt-a-2
Skills: 3

## Skills and Examples

- [Add Sub Within 1000 Algorithm](/math/skills/nbt/add-sub-within-1000-algorithm) — Whole-Number Operations and Fact Fluency
- [Add Sub Within 1000 Models](/math/skills/nbt/add-sub-within-1000-models) — Whole-Number Operations and Fact Fluency
- [Operations Properties Apply](/math/skills/oa/operations-properties-apply) — Equations, Variables, Expressions, and Inequalities