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### Course: 1st grade > Unit 2

Lesson 9: Intro to addition with 2-digit numbers- Adding 2-digit numbers without regrouping 1
- Adding 2-digit numbers without regrouping
- Adding up to four 2-digit numbers
- Breaking apart 2-digit addition problems
- Break apart 2-digit addition problems
- Regrouping to add 1-digit number
- Adding by making a group of 10
- Regroup when adding 1-digit numbers

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# Adding up to four 2-digit numbers

## Problem

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