2-Operations+and+Algebraic+Thinking

Operations & Algebraic Thinking 2.OA  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.1
 * 2.oa.1 Tasks
 * This wiki provides several tasks that require students to demonstrate understanding of this standard.
 * [|Howard County Public Schools- 2.oa.1]
 * This wiki provides task, learning targets and other grade 2 resources.

Add and subtract within 20. 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.

Work with equal groups of objects to gain foundations for multiplication. 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.

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.
 * [[file:2.oa.4.pptx]]