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- 1.OA.B.3Apply 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.)
- 1.OA.B.4Understand subtraction as an unknown-addend problem. For example, subtract 10 - 8 by finding the number that makes 10 when added to 8.

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.)

3 Addends

1st Grade Math

Â» Unit:

Problem Solving Addition

Big Idea:When we add 3 addends we can look for a friendly combination to make our work easier

Commutative Property: First Grade Style

1st Grade Math

Â» Unit:

Understanding Addition

Big Idea:My students are learning addition strategies. I want my little ones to learn they numbers can change order and be added and the result will be the same. It's the Commutative Property!

Identify Related Facts - Day 1 of 2

1st Grade Math

Â» Unit:

Single Digit Addition and Subtraction

Big Idea:It's all in the family! In this lesson, students will begin to identify and understand the relationship between addition and subtraction sentences.

Using 3 or More Addends to Make a Meal

1st Grade Math

Â» Unit:

Problem Solving Addition

Big Idea:Using the theme of a very YUMMY Thanksgiving meal, students will plan their own meal and figure out the cost of it.

Crayon Box Combinations

1st Grade Math

Â» Unit:

Properties of Addition and Subtraction

Big Idea:Students think deeply about how to make 9 using different combinations of red and blue crayons. This builds number sense and sets them up for later math fact fluency!

Peas and Carrots...Carrots and Peas

1st Grade Math

Â» Unit:

Properties of Addition and Subtraction

Big Idea:Students "sweat" in this difficult task where they work to find all of the combinations for 7 and 8.

Identify Related Facts - Day 2 of 2

1st Grade Math

Â» Unit:

Single Digit Addition and Subtraction

Big Idea:It's all in the family! In this lesson, students will build fact family "houses" by using 3 numbers and writing the related addition and subtraction sentences.

10 and Some More

1st Grade Math

Â» Unit:

Complements of 10 and 20

Big Idea:Your students will play a game where they combine two single digit numbers and then record that total in terms of how it relates to ten.

12 Apples and Bananas

1st Grade Math

Â» Unit:

The Number 10 and the Addition and Subtraction Concept

Big Idea:Early in the year we sang Apples and Bananas and solved for combinations of 7 and 8. Now we are upping the ante and moving in numbers beyond 10. This lesson challenges the students to find all of the possible combinations for the number 12.

Recording Related Facts

1st Grade Math

Â» Unit:

Single Digit Addition and Subtraction

Big Idea:In this lesson the children begin to make the connection that two addition sentences are related through the commutative property.

Flip Flop

1st Grade Math

Â» Unit:

Properties of Addition and Subtraction

Big Idea:Students explore the Commutative Property and learn why you can "flip flop" the addends and still get the same answer!

Word Problems with 3 Addends Part II

1st Grade Math

Â» Unit:

Word Problems

Big Idea:My students have worked on joining 3 addends using drawings, objects, and equations. This lesson will supply concentrated practice on solving 3 addend equations with sums less than or equal to 20.

4 Square Fact or Fiction

1st Grade Math

Â» Unit:

Solving 3 Addend Problems

Big Idea:Which one of these is not like the other?! Students apply their understanding of 3 addend equations to decide which number sentence in a group of 4 is false. First person to find the false number sentence wins!

Complements of 10

1st Grade Math

Â» Unit:

The Number 10 and the Addition and Subtraction Concept

Big Idea:Quicker than the Flash. Today your students will work on their complement of 10 fluency. They will then solve a story problem that will allow them to connect their knowledge of ten in a real world situation.

Keep it Simple

1st Grade Math

Â» Unit:

Solving 3 Addend Problems

Big Idea:Introduce students to the concept of "simplifying" as they find the friendly number sentences that help them solve 3 addend number sentences!

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.)

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.