Main content
Course: 3rd grade?>?Unit 3
Lesson 3: Strategies for adding two and three-digit numbersAdd using groups of 10 and 100
Problem
Fill in the blank.
If you're seeing this message, it means we're having trouble loading external resources on our website.
If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.