Operations And Algebraic Thinking
Outcomes
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Represent And Solve Problems Involving Addition And Subtraction.
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2.OA.1
Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.1Play Activities 170Examples
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2.OA.1
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Add And Subtract Within 20.
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2.OA.2
Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two one-digit numbers.Examples
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2.OA.2
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Work With Equal Groups Of Objects To Gain Foundations For Multiplication.
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2.OA.3
Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.Examples
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2.OA.4
Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.Examples
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2.OA.3