# CCSS.2.NBT.B.9

place value reasoning, operation properties, strategy explanation; explain, justify.

System: US Common Core Math
Route: /math/standards/us-ccss/curratom-us-ccss-2-nbt-b-9
Skills: 1

## Skills and Examples

- [Operations Properties Apply](/math/skills/oa/operations-properties-apply) — Equations, Variables, Expressions, and Inequalities