# 2.2 Adding and Subtracting within 100

## Unit Goals

- Students add and subtract within 100 using strategies based on place value, properties of operations, and the relationship between addition and subtraction. They then use what they know to solve story problems.

### Section A Goals

- Add and subtract within 100 using strategies based on place value and the relationship between addition and subtraction. Problems in this section are limited to the problems like 65 – 23, where decomposing a ten is not required.

### Section B Goals

- Subtract within 100 using strategies based on place value, including decomposing a ten, and the properties of operations.

### Section C Goals

- Represent and solve one- and two-step problems involving addition and subtraction within 100, including different problem types with unknowns in all positions.