Operations and Algebraic Thinking

Represent and solve problems involving addition and subtraction.
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.
(See Glossary, Table 1).

Tasks
Add to/Result Unknown
(Kindergarten)
Add to/Change Unknown
1.OA Task 3a; 1.OA 3a Student Form
1.OA Task 3b; 1.OA 3b Student Form
1.OA Task 3c; 1.OA 3c Student Form
1.OA Task 3d; 1.OA 3d Student Form
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Add to/Start Unknown
(2nd Grade)
Take From/Result Unknown
(Kindergarten)
Take From/Change Unknown
1.OA Task 4a; 1.OA 4a Student Form
1.OA Task 4b; 1.OA 4b Student Form
1.OA Task 4c; 1.OA 4c Student Form
1.OA Task 4d; 1.OA 4d Student Form
0
Take From/Start Unknown
(2nd Grade)
Put Together-Take Apart/Total Unknown
(Kindergarten)
Put Together-Take Apart/Addend Unknown
1.OA Task 3aa; 1.OA 3aa Student Form
1.OA Task 3bb; 1.OA 3bb Student Form
1.OA Task 3cc; 1.OA 3cc Student Form
0
Put Together-Take Apart/Both Addends Unknown
1.OA Task 2a; 1.OA 2a Student Form
1.OA Task 2b; 1.OA 2b Student Form
1.OA Task 8a; 1.OA 8a Student Form
1.OA Task 8b; 1.OA 8b Student Form
Compare/Difference Unknown ("How many more?") 00000
1.OA Task 5a; 1.OA 5a Student Form
1.OA Task 5b; 1.OA 5b Student Form
1.OA Task 5c; 1.OA 5c Student Form
1.OA Task 5d; 1.OA 5d Student Form
0
Compare/Bigger Unknown ("more")
1.OA Task 6a; 1.OA 6a Student Form
1.OA Task 6b; 1.OA 6b Student Form
1.OA Task 6c; 1.OA 6c Student Form
1.OA Task 6d; 1.OA 6d Student Form
Compare/Smaller Unknown ("more")
(2nd Grade)
Compare/Difference Unknown ("How many fewer?") 00000
1.OA Task 7a; 1.OA 7a Student Form
1.OA Task 7b; 1.OA 7b Student Form
1.OA Task 7c; 1.OA 7c Student Form
1.OA Task 7d; 1.OA 7d Student Form
Compare/Bigger Unknown ("fewer")
(2nd Grade)
Compare/Smaller Unknown ("fewer")
1.OA Task 9a; 1.OA 9a Student Form
1.OA Task 9b; 1.OA 9b Student Form
1.OA Task 9c; 1.OA 9c Student Form
1.OA Task 9d; 1.OA 9d Student Form
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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.
Tasks
1.OA Task 11a; 1.OA 11a Student Form
1.OA Task 11b; 1.OA 11b Student Form
1.OA Task 11c; 1.OA 11c Student Form