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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.

Math Fact Sorting

1st Grade Math

Â» Unit:

Solving 3 Addend Problems

Big Idea:Students work to solve multiple 3 part number sentences and determine if they are equal or not! Students practice using less than, equal to and greater than language!

How Many In My Hand?

1st Grade Math

Â» Unit:

Building Numbers

Big Idea:Today everyone becomes a magician as students are able to use a known starting number and one chunk (addend) of that known number, to determine the amount that is being hidden.

Unknown Addend Problems

1st Grade Math

Â» Unit:

Subtraction Strategies

Big Idea:I CAN is a big statement. Students have been practicing subtraction and we want them to persevere and solve word problems to create their own subtraction number sentences. They will use known addition facts to solve subtraction problems.

Life-size Missing Parts of 9

1st Grade Math

Â» Unit:

Understanding Subtraction

Big Idea:I want them to develop fluency in subtraction and get them ready for future standards like 1.NBT.C.6, double digit subtraction. This can be done by providing them multiple opportunities to problem solve.

Scoot for the Missing Parts of 8

1st Grade Math

Â» Unit:

Understanding Subtraction

Big Idea:I want my students to develop fluency in subtraction and get them ready for future standards like 1.NBT.6, double digit subtraction. This can be done by providing them multiple opportunities to problem solve.

End of Unit Assessment

1st Grade Math

Â» Unit:

Complements of 10 and 20

Big Idea:Today's lesson will allow you to see how your students have developed with their understanding of groupings, complements of 10 and 20 and how fluently they can add and/or subtract within 10.

The Number Ten

1st Grade Math

Â» Unit:

The Number 10 and the Addition and Subtraction Concept

Big Idea:Students will revisit an old routine as they work with larger groups of dots and record the number of dots that were flashed before them. Students will represent a variety of ways to represent the number 10.

Detectives are on the HUNT for Missing parts of 6 and 7!

1st Grade Math

Â» Unit:

Understanding Subtraction

Big Idea:Detectives it is time to search! The children will become great investigators and solve problems by finding the missing part.

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.