Unit 1.3 Using Place Value to Add and Subtract within 100
Learning Objectives
Students will be able to:
* Add and subtract within 100 using strateies based on place value.
* Add and subtract within 100 using the commutative property. (3+2=2+3)
* Add and subtract within 100 using the associative property.
* Add within 100 using the zero property of addition.
* Add and subtract within 100 using the relationship between addition and subtraction.
* Solve one-step word problems within 100 involving "add to" and "take away" situations.
Essential Questions
* How do you decide which math operation to use to solve a given word problem?
* How do you decide which math operation to use to solve a given word problem?
* How can you explain the strategy you chose to solve a given problem?
* How is your solution similar to your neighbor's? How is your solution different from your neighbor's?
* Why did you choose that equation to describe that particular word problem (or situation)?
Key Vocabulary
compose decompose add-on commutative property associative property zero property of addition
Common Core State Standards for Mathematical Content
Number and Operations in Base Ten 2.NBT
Use place value understanding and properties of operations to add and subtract.
*2.NBT.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Operations and Algebraic Thinking
2.OA Represent and solve problems involving addition and subtraction.
2.OA.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.1
Mathematical Practices to Be Integrated
1 Make sense of problems and persevere in solving them.
* Explain correspondences /connections between the different representations (e.g. between the number
line and the equation).
* Use the number line to assist in solving problems in addition and subtraction.
* Use drawings and equations to represent and solve a problem.
4 Model with mathematics.
* Write addition and/or subtraction equations to represent or describe problem situations.
* Use drawings to represent a problem.
Students will be able to:
* Add and subtract within 100 using strateies based on place value.
* Add and subtract within 100 using the commutative property. (3+2=2+3)
* Add and subtract within 100 using the associative property.
* Add within 100 using the zero property of addition.
* Add and subtract within 100 using the relationship between addition and subtraction.
* Solve one-step word problems within 100 involving "add to" and "take away" situations.
Essential Questions
* How do you decide which math operation to use to solve a given word problem?
* How do you decide which math operation to use to solve a given word problem?
* How can you explain the strategy you chose to solve a given problem?
* How is your solution similar to your neighbor's? How is your solution different from your neighbor's?
* Why did you choose that equation to describe that particular word problem (or situation)?
Key Vocabulary
compose decompose add-on commutative property associative property zero property of addition
Common Core State Standards for Mathematical Content
Number and Operations in Base Ten 2.NBT
Use place value understanding and properties of operations to add and subtract.
*2.NBT.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Operations and Algebraic Thinking
2.OA Represent and solve problems involving addition and subtraction.
2.OA.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.1
Mathematical Practices to Be Integrated
1 Make sense of problems and persevere in solving them.
* Explain correspondences /connections between the different representations (e.g. between the number
line and the equation).
* Use the number line to assist in solving problems in addition and subtraction.
* Use drawings and equations to represent and solve a problem.
4 Model with mathematics.
* Write addition and/or subtraction equations to represent or describe problem situations.
* Use drawings to represent a problem.