The Abacus is a calculating tool often used in mathematics. The Abacus been used since ancient times and is still in use today. The Abacus consists of a number of rows of movable beads or other small objects which represents digits or numbers.

Native Americans used abacuses in ancient times. Aztecs used an abacus called a NEPOHUALTZINTZIN. This abacus had a 5 digit base-20 system.

Although today calculators  are more commonly  used in mathematics abacuses remain in use in some countries.

 Funny video how to use an Abacus 

Ancient Chinese Mathematics: the Abacus

How to use an abacus video tutorials

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National Common Core Standards US for Math K-12

Kindergarten Common Core Math Classroom activities and games for math

2nd Grade Math Common Core Classroom Activities and Games

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Here are some addition games:

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Free Presentations in PowerPoint format