Operations and Algebra
Unit 1 PDF
Parent Letter
Learning Progressions
Unit 1  Operations and Algebraic Thinking (September/October  30 days)
Students develop strategies for adding and subtracting whole numbers based on their prior work with small numbers. They use a variety of models, including discrete objects and lengthbased models (e.g., cubes connected to form lengths), to model addto, takefrom, puttogether, takeapart, and compare situations to develop meaning for the operations of addition and subtraction, and to develop strategies to solve arithmetic problems with these operations.
Quick Links to standards in this Unit: 1.OA.1, 1.OA.2, 1.MD.4, 1.OA.3, 1.OA.4, 1.OA.8, 1.OA.5, 1.OA.6, and 1.OA.7
Reference and Resource Books
Unit 1 AIMS Alignment Chart
CCPS Grade 1 Video References
1.OA.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. 

Text References 

1.OA.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. 

Text References Discovery Education Resources 1.OA.2 Lesson Seeds 

1.MD.4 Organize, represent, and interpret data with up to three categories; ask and answer questions about the total number of data points, how many in each category, and how many more or less are in one category than in another. 

Text References
Discovery Education Resources 1.MD.4 

1.OA.3 Apply properties of operations as strategies to add and subtract. 

Text References Discovery Education Resources 1.OA.3 

1.OA.4 Understand subtraction as an unknownaddend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8. Add and subtract within 20. 

Text References Discovery Education Resources 1.OA.4 Online Resources Lesson Seeds


1.OA.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 = _. 

Text References Discovery Education Resources 1.OA.8 

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

Text References Discovery Education Resources 1.OA.5 Online Resources Lesson Seeds 
Formative Assessments 
Text References Teacher Submitted Resources  Intranet Only
Discovery Education Resources 1.OA.6
Lesson Seeds 
Formative Assessments 
Text References Teacher Submitted Resources  Intranet Only
Discovery Education Resources 1.OA.7 (Open the Discovery Education website first) Online Resources
Lesson Seeds

