Essential Questions:
Unit 4 instructional time is focused on these power standards:
2.NBT.B.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
2.NBT.B.6 Add up to four twodigit numbers using strategies based on place value and properties of operations.
2.NBT.B.7 Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
2.NBT.B.9 Explain why addition and subtraction strategies work, using place value and the properties of operations.
2.OA.A.1 Use addition and subtraction within 100 to solve one and twostep word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem. SAMPLE assessment items for 2.OA.A1
2.MD.C.8 Solve word problems involving dollar bills, quarters, dimes, nickels, and pennies, using money symbols appropriately.
Unit 3 instruction is supported by these standards:
2.OA.B.2 Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two onedigit numbers.
2.NBT.B.8 Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.
2.MD.B.6 Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, ..., and represent wholenumber sums and differences within 100 on a number line diagram.
 How can I add or subtract big numbers in my head?
 What makes an efficient and effective addition or subtraction strategy?
 There are many different strategies to add and subtract multidigit numbers.
 People use the most efficient and effective addition or subtraction strategy when solving problems.
Unit 4 instructional time is focused on these power standards:
2.NBT.B.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
2.NBT.B.6 Add up to four twodigit numbers using strategies based on place value and properties of operations.
2.NBT.B.7 Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
2.NBT.B.9 Explain why addition and subtraction strategies work, using place value and the properties of operations.
2.OA.A.1 Use addition and subtraction within 100 to solve one and twostep word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem. SAMPLE assessment items for 2.OA.A1
2.MD.C.8 Solve word problems involving dollar bills, quarters, dimes, nickels, and pennies, using money symbols appropriately.
Unit 3 instruction is supported by these standards:
2.OA.B.2 Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two onedigit numbers.
2.NBT.B.8 Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.
2.MD.B.6 Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, ..., and represent wholenumber sums and differences within 100 on a number line diagram.
What to teach 
LEsson Ideas 
Student PRactice 
Unit 4 Outline
Preassessment Introduce Real World Experience Topic 1: Multidigit Addition Strategies for Numbers Requiring Regrouping (8 days)

Use of number talks continually throughout the year will develop fluency with multidigit addition and subtraction
many of the resources listed in unit 3 will be helpful to extend addition and subtraction understanding Video to show Uses for Tape Diagrams (Bar Models) Greg Tang Word Problem Generator Model & Solve Word Problems with Thinking Blocks K5 Math3 Digit Addition with Decomposing 
Topic 2: Multidigit Addition with More Than Two Addends (2 days)

Topic 3: Multidigit Subtraction (8 days)

Topic 4: One and Two Step Word Problems (5 days)

2.OA.A.1 word problem examples
Word Problems from North CarolinaTaking Apart the KeyWord Strategy  blog post Greg Tang Word Problem Generator Model & Solve Word Problems with Thinking Blocks Achieve the Core Exemplar lesson for Addition & Subtraction within 1000 & word Problems SMARTboard Wonderful Word Problems 