Khan Academy (English - US curriculum)
Math by grade
Eureka Math/EngageNY
3rd grade foundations (Eureka Math/EngageNY)
Module 3: Foundations
Topic B: Foundations
Adding 2-digit numbers without regrouping
Adding 2-digit numbers without regrouping
Sal adds 23 + 45 thinking about place value.
License: CC BY-NC-SA by Khan Academy