# Module 4

## Standards

2.OA.A.1: Use addition and subtraction within 100 to solve one- and two-step 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.

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 two-digit 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.7.1: Use estimation strategies to make reasonable estimates in problem solving. CA

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.NBT.B.9: Explain why addition and subtraction strategies work, using place value and the properties of operations.

## Anchor Charts 20180521150336050.pdf 20180521151918247.pdf ## Strategies 2OA1.pdf 2NBT5.pdf 2NBT6.pdf 2NBT7.pdf 2NBT8.pdf 2NBT9.pdf

## Videos 2.OA.2 2.NBT.5 Easy as Pie.pdf 2.OA.2 2.NBT.5 Road Rally.pdf 2.NBT.B.8_Choral_Counting.pdf 2.NBT.B.6_Toll_Bridge_Puzzle.pdf 2.NBT.B.7_How_Many_Days_Until_Summer_Vacation.pdf 2.NBT.B.7_Peyton_and_Presley_Discuss_Addition.pdf 2.NBT.B.7_Many_Ways_to_do_Addition_2.pdf