Unit 4: Adding and Subtracting Decimals 

Lesson 4-1: Estimate Sums and Differences of Decimals

Lesson 4-2:  Represent Addition of Decimals

Lesson 4-3: Represent Addition of Teths and Hundreths 

Lesson 4-4: Use partial Sums to Add Decimals 

Adding Decimals using Standard Algorithm

Lesson 4-5:  Represent Subtraction of Decimals

Lesson 4-6: Represent Subtraction of Teths and Hundreths 

Lesson 4-7: Stategies to Subtract Decimals