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

Addition sentences

Addition Sentences

Add two numbers

Add Two Numbers

Add three numbers

Add Three Numbers

Addition word problems within 20

Addition Word Problems within 20

Relate addition and subtraction

Relate Addition and Subtraction

Count back to subtract

Count Back to Subtract

Fact families

Fact Families

Subtraction word problems within 20

Subtraction Word Problems within 20