Math - Unit 2 Becoming Fluent with Addition and Subtraction
Unit 2 Common Core Standards

2.OA.1 Use addition and subtraction within 100 to solve one and two step word problems using drawings and equations.

2.OA.2 Fluently add and subtract within 20 using mental strategies.  By end of Grade 2, know from memory all sums of two one-digit numbers.

2.NBT.5 Add and subtract within 100 using strategies based on place value, properties of operations and/or the relationship between addition and subtraction.

2.MD.8 Solve word problems involving dollar bills, quarters, dimes, nickels, and pennies, using $ and
 ¢ symbols appropriately.