2.OA.B.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.
Grade 2
2.OA.A.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.G.A
Reason with shapes and their attributes.
2.MD.D
Represent and interpret data.
2.MD.C
Work with time and money.
2.MD.B
Relate addition and subtraction to length.
2.MD.A
Measure and estimate lengths in standard units.
2.NBT.B
Use place value understanding and properties of operations to add and subtract.
2.NBT.A
Understand place value.
2.OA.C
Work with equal groups of objects to gain foundations for multiplication.