Before You Begin this Unit…  Unit at a Glance  
Students have been working on addition and subtraction fluency since Kindergarten. In grade 3, students were expected to fluently add and subtract within 1,000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.
By the end of 4^{th} grade, students should have been able to fluently add and subtract multidigit whole numbers. In grade 5, students are expected to add and subtract decimals to hundredths, using concrete models or drawings and strategies based on place value. Because students will use the same place value understanding for adding and subtracting decimals as they used for adding and subtracting whole numbers, it is vital to spend some time revisiting addition and subtraction whole number work before moving forward with decimals. At the end of this unit, the tasks and lessons that are provided should be used to specifically address 5.NBT.1 and 5.OA.1 and 5.OA.2. 
Suggested Dates:
*Investigation 3: 4 lessons Lessons (3.1 3.4)
Additional Tasks and Lessons: The additional tasks and lessons should be used for the final 3 days of this 12 day unit. 

Standards Addressed in the Unit  
Link to CCSS Unpacking Document Updated Sept. '15 Standard to Revisit and Maintain:
Grade 5 Standards:
5.OA.2. Use parentheses, brackets, or braces in numerical expressions, and evaluate expressions with these symbols.
5.OA.1. Write simple expressions that record calculations with numbers, and interpret numerical expressions without evaluating them. For example, express the calculation "add 8 and 7, then multiply by 2" as 2 × (8 + 7). Recognize that 3 × (18932 + 921) is three times as large as 18932 + 921, without having to calculate the indicated sum or product. 5.NBT.1 Recognize that in a multidigit number, a digit in one place represents 10 times as much as it represents in the place to its right and 1/10 of what it represents in the place to its left.
