# 3.3 Wrapping Up Addition and Subtraction Within 1,000

## Unit Goals

- Students use place value understanding to round whole numbers and add and subtract within 1,000. They also represent and solve two-step word problems using addition, subtraction, and multiplication and assess the reasonableness of answers.

### Section A Goals

- Fluently add within 1,000 using algorithms based on place value and properties of operations.
- Use place value understanding to compose and decompose numbers.

### Section B Goals

- Fluently subtract within 1,000 using algorithms based on place value, properties of operations, and the relationship between addition and subtraction.

### Section C Goals

- Round whole numbers to the nearest multiple of 10 and 100.

### Section D Goals

- Assess the reasonableness of answers.
- Solve two-step word problems using addition, subtraction, and multiplication.