Diverse contexts such as "take away," comparison," and "completion" give rise to subtraction problems. The take-away interpretation of subtraction has been explored using two-colored chips to help students understand addition and subtraction of integers. This article illustrates how the difference and completion (or missing addend) interpretations of subtraction may be used with chips of two colors to help students develop a better understanding of the subtraction of negative and positive numbers. (Contains 9 figures.)