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Combine number tiles to make zero. Each step reduces the number tile by 1. When tiles overlap, their numbers combine. For example, imagine the number (+2) is next to (-1). On the next move, (+2) is reduced by 1 to become (+1). If (+1) combines with (-1), the sum will be zero. There are 50 math puzzles to solve!
Stetch Sums - Learning Connections
Essential Skills
Problem Solving
Sequential Reasoning
Mental Computation

Common Core Connection
MP1 - Make sense of problems and persevere in solving them.
MP7 - Look for and make use of structure.
Math Playground