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Grade 2: Operations and Algebraic Thinking

123 preguntas8 habilidades

2.OA.A.1

105 preguntas7 habilidades
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.
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
 Pronto habrá nuevas habilidades para este estándar.
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.
 Pronto habrá nuevas habilidades para este estándar.

2.OA.C.4

18 preguntas1 habilidad
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.