Reduce each number to zero by placing subtraction discs on the grid
Blue discs only work along diagonal lines.
Red discs only work along horizontal and vertical lines.
More Math Games to Play
Sum Points - Learning Connections
Essential Skills
Problem Solving - look for the best sequence of steps
Numerical Thinking - reason about numbers and perform mental math
Spatial Reasoning - use horizontal, vertical, and diagonal directions

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