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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!
Share to Google Classroom
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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