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Place a number disc on every vertex.
The middle number on each line segment is the sum of the two numbers on either side.
Make your own number puzzles, too!
Sum Shapes - Learning Connections
Essential Skills
Problem Solving - number puzzles
Numerical Reasoning - consider various number arrangements

Common Core Connection for Grades 2+
Fluently add and subtract within 20 using mental strategies.
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
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