1st Grade Math

Module 3: Building and Explaining the Relationship Between Addition and Subtraction

1.NR.2.1 Use a variety of strategies to solve addition and subtraction problems within 20.

1.NR.2.2 Use pictures, drawings, and equations to develop strategies for addition and subtraction within 20 by exploring strings of related
problems.

1.NR.2.3 Recognize the inverse relationship between subtraction and addition within 20 and use this inverse relationship to solve authentic
problems.

1.NR.2.4 Fluently add and subtract within 10 using a variety of strategies.

1.NR.2.5 Use the meaning of the equal sign to determine whether equations involving addition and subtraction are true or false.

1.NR.2.6 Determine the unknown whole number in an addition or subtraction equation relating to three whole numbers.

1.NR.2.7 Apply properties of operations as strategies to solve addition and subtraction problem situations within 20.