The Relationship Between Addition and Subtraction (Grade 1)

This lesson set provides an in-depth study of part-part-whole relationships as represented in "take from" and "take apart" situations and subtraction equations. Students will:

• solve "take from" and "take apart" situations using a variety of strategies and part-part-whole maps;
• determine if the "unknown" in a situation represents a part of the situation or the whole amount in a situation;
• interpret tables and diagrams;
• discuss subtraction as addition with an unknown-addend; and
• write and discuss related addition and subtraction equations.

Standards: 1.OA.A.1, 1.OA.B.4, 1.OA.C.6, 1.OA.D.7