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### Operations & Algebraic Thinking

Operations &Algebraic Thinking (OA)

Represent and solve problems involving addition and subtraction.

CCSS.MATH.CONTENT.1.OA.A.1
Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.1

CCSS.MATH.CONTENT.1.OA.A.2
Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

Understand and apply properties of operations and the relationship between addition and subtraction.

CCSS.MATH.CONTENT.1.OA.B.3
Apply properties of operations as strategies to add and subtract.2 Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)

CCSS.MATH.CONTENT.1.OA.B.4
Understand subtraction as an unknown-addend problem. For example, subtract 10 - 8 by finding the number that makes 10 when added to 8.

CCSS.MATH.CONTENT.1.OA.C.5
Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

CCSS.MATH.CONTENT.1.OA.C.6
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

Work with addition and subtraction equations.

CCSS.MATH.CONTENT.1.OA.D.7
Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 - 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.

CCSS.MATH.CONTENT.1.OA.D.8
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ - 3, 6 + 6 = _.

 Operations & Algebraic Thinking CCSS EDM Lessons EDM Assessment Part A Unit Assessment NJ MODEL UNIT Benchmark MP 1.OA.1 1.5, 1.13, 2.6, 2.7, 2.8, 2.11, 2.12, 2.13, 3.6, 3.1, 3.12, 2.13, 3.6, 3.11, 3.12, 3.13, 3.14, 4.3, 4.6, 4.7, 4.9, 5.5, 5.6, 5.7, 5.8, 5.10, 6.3, 6.9, 6.10, 10.3, 10.4, Project 8 2,3,4,5,6,8 Unit 2-1 Unit 2-2 Bench MP2 Unit 4-1 Bench MP4 2,4,5 2,4 1.OA.2 2.13, 3.10, 8.4 3,6,7,8,9 Unit 2-2 Bench MP2 2 2 1.OA.3 2.13, 3.10, 4.11, 4.12, 5.5, 5.8, 5.11, 5.12, 5.13, 6.1, 6.3, 6.4 7,8 Unit 2-1 Unit 2-2 Bench MP2 1 2 1.OA.4 2.13, 4.11, 5.7, 5.8, 6.3, 6.5, 8.5, 10.4 6,10 Unit 1-2 Bench MP1 1 1 1.OA.5 2.11, 2.13, 3.6, 3.8, 3.9, 3.10, 6.3, 6.8, 8.5 1,2,3,4 Unit 1-1  Unit 1-2 Bench MP1 1 1 1.OA.6 1.5, 1.10, 1.13, 2.1, 2.2, 2.3, 2.8, 2.11, 2.12, 2.13, 3.6, 3.9, 3.14, 4.2, 4.6, 4.7, 4.8, 4.11, 4.12, 5.5, 5.7, 5.9, 5.10, 5.11, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 7.1, 7.2, 7.3, 7.7, 8.2, 8.3, 8.5, 8.7, 8.8, 8.9, 9.1, 9.6, 9.7, 10.2 2,3,4,5,6,7,8,9,10 Unit 2-2 Bench MP2 1,4,5 2 1.OA.7 2.11, 3.6, 4.12, 5.3, 5.10, 6.2, 8.2 7,9,10 Unit 1-2 Bench MP1 2 1 1.OA.8 3.8, 3.9, 4.11, 4.12, 5.8, 5.10, 5.11, 5.12, 5.13, 6.3, 6.4, 6.5, 6.6, 6.8 10 Bench MP1 2 1

Operations & Algebraic Thinking (OA) 1.OA.1

1.OA.A.1

Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

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Addition and Subtraction Word Problems 1

Do these activities: KHAN ACADEMY 1.OA.A.1 ACTIVITY 1 - Addition and Subtraction Word Problems 1

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Addition and Subtraction Word Problems 2

Do these activities: KHAN ACADEMY 1.OA.A.1 ACTIVITY 2 - Addition and Subtraction Word Problems 2

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Do these activities: KHAN ACADEMY 1.OA.A.1 ACTIVITY 3 - Addition Within 20

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Word Problems With "More" and "Fewer" 1

Do these activities: KHAN ACADEMY 1.OA.A.1 ACTIVITY 4 - Word Problems With "More" and "Fewer" 1

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Word Problems With "More" and "Fewer" 2

Do these activities: KHAN ACADEMY 1.OA.A.1 ACTIVITY 5 - Word Problems With "More" and "Fewer" 2

Operations & Algebraic Thinking (OA) 1.OA.2

1.OA.A.2

Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

Watch This Video

 Operations & Algebraic Thinking (OA)1.OA.A2IXL Activities

Operations & Algebraic Thinking (OA) 1.OA.3

1.OA.B.3

Apply properties of operations as strategies to add and subtract. Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)

Watch This Video

Videos for this standard are coming soon to Khan Academy.

Fact Triangle

Fact Family

3 + 4 = 7

4 + 3 = 7

7 – 4 = 3

7 – 3 = 4

## Khan Academy: Apply properties of operations as strategies to add and subtract.

Do these activities: KHAN ACADEMY 1.OA.B.3 ACTIVITIES (Coming Soon)

Operations & Algebraic Thinking (OA) 1.OA.4

1.OA.B.4

Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.

Watch This Video

 Operations & Algebraic Thinking (OA)1.OA.B4IXL Activities

 Operations & Algebraic Thinking (OA) 1.OA.5 1.OA.C.5Relate counting to addition and subtraction (e.g., by counting on 2 to add 2). Khan Academy: Add and subtract within 20.Watch This Video Skills for this standard are coming soon to Khan Academy.Do these activities: KHAN ACADEMY 1.OA.C.5 ACTIVITIES (Coming Soon)

Operations & Algebraic Thinking (OA) 1.OA.6

1.OA.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

Watch This Video

Operations & Algebraic Thinking (OA) 1.OA.7

1.OA.D.7

Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 – 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.

Watch This Video

Equal sign | Addition and subtraction within 20 | Early Math | Khan Academy

Khan Academy: Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false.

Do these activities: KHAN ACADEMY 1.OA.D.7 ACTIVITIES

Operations & Algebraic Thinking (OA) 1.OA.8

1.OA.D.8

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = ? – 3, 6 + 6 = ?.

Watch This Video

Equal sign | Addition and subtraction within 20 | Early Math | Khan Academy

Do these activities: KHAN ACADEMY 1.OA.D.8 ACTIVITIES

 Operations & Algebraic Thinking (OA)1.OA.D8IXL Activities

Operations and Algebraic Thinking (OA) Games

Represent and solve problems involving addition and subtraction.
Understand and apply properties of operations and the relationship between addition and subtraction.