2.OA - Operations & Algebraic Thinking

From EngageNY

Represent and solve problems involving addition and subtraction.
  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.*
Add and subtract within 20.
  1. Fluently add and subtract within 20 using mental strategies.** By end of Grade 2, know from memory all sums of two one-digit numbers.
Work with equal groups of objects to gain foundations for multiplication.
  1. 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.
  2. 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.
* See Glossary, Table 1.
** See standard 1.OA.6 for a list of mental strategies.

Supporting Materials

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My Even Day

In this delightful, rhythmic sequel to One Odd Day, the young boy awakens to find that it is another strange day—now everything is even, and his mother has two heads! This time, a school field trip to the zoo is dealt with in an odd, but even-handed manner. And, like its predecessor, children...

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One Odd Day

One Odd Day tells the humorous story of a young child who awakens to find everything around him is “odd.” He has three sleeves on his shirt, and his dog has five legs. Things are no better at school either when he stares at a calendar with only odd days. Will his odd day end when he goes to bed...

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