1.oa.3 Worksheets

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Previous Standard 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.
Next Standard Understand the relationship between numbers and quantities; connect counting to cardinality.
Operations and Algebraic Thinking Understand and apply properties of operations and the relationship between addition and subtraction. 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.)