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Combine number balls to make sums up to 20. Try to remove all addends before time runs out.
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Number Bonds to 20 - Learning Connections
Essential Skills
Mental Math - practice quick recall of basic addition facts
Problem Solving - plan ahead to make as many number bonds as possible

Common Core Connection for Grades 1 and 2
Demonstrating fluency for addition within 20.
Use strategies such as counting on and making ten.
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