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 Standards
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. 

Teacher Resources


Student Resources Domino Writing 
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. 

Teacher Resources 

Student Resources 
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. 

Teacher Resources


Student Resources Bar Charts/Graphs  NLVM Tallies and Graphs  BBC Create a Graph  NCES 
1.OA.3 Apply properties of operations as strategies to add and subtract. 

Teacher Resources 

Student Resources 
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. 

Teacher Resources 

Student Resources 
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 = _. 

Teacher Resources 

Student Resources Find the Missing Number  K5Teaching 
1.OA.5 Relate counting to addition and subtraction (e.g., by counting on 2 to add 2). 

Teacher Resources 
Formative Assessments 
Student Resources 
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Teacher Resources Lesson Seeds 

Student Resources Equal Sums  K5Teaching 