For activities with important visual aids. Unit: 3.3 Wrapping Up Addition and Subtraction Within 1,000 (Grade 3). 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 r