Topic 9- Subtracting Two-Digit Numbers

Lesson 9-1 Subtraction:  Regrouping 1 Ten for 10 Ones

Lesson 9-2 Subtraction:  Models to Subtract Two- and One-Digit Numbers

Lesson 9-3 Subtraction:  Subtracting Two- and One-Digit Numbers

Lesson 9-4 Subtraction:  Models to Subtract Two-Digit Numbers

Lesson 9-5 Subtraction:  Subtracting Two-Digit Numbers

Lesson 9-6 Subtraction:  Subtracting on a Number Line

Lesson 9-7 Subtraction:  Using Addition to Check Subtraction

Lesson 9-8 Subtraction:  Ways to Subtract

Lesson 9-9 Subtraction:  Two-Question Problems