Comparing Stacks, A Great Model for Subtraction

Comparing Stacks, A Great Model for Subtraction is a Grade 6 integer activity that uses colored stacks and zero pairs to make subtraction visible. Students model the starting integer, add zero pairs when needed, remove the quantity being subtracted, and interpret what remains. The process shows why subtracting a negative can increase a value without asking students to memorize a sign rule first.

Use it for whole-class modeling or guided practice after students understand positive and negative counters. Ask students why adding a zero pair changes the model but not its value. The catalog currently lists no standards for this activity. Generate teacher-ready lesson support with a free Find a Math Game account. No credit card; 3 lifetime generations.