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The abacus is a counting frame used during the medieval ages before the formal system
of calculations using Hindu and Arabic numerals were introduced.
Using the Abacus one can perform addition, subtraction, multiplication, division, 
one can find the LCM and HCF of two numbers ,Find Square roots and perform a few other arithmetic operations.

This app supports Learning the ABACUS using Arithmetic operations. . 

The APP will simulate a real world Abacus. This android app supports a graphics based Abacus tool. The user can also use a real Abacus in addition to the graphical tool enabled in the app to understand the tutorials/examples. 

Tutorials are separated into Beads and Numbers, Simple Addition, Addition using complements Subtraction and Simple Multiplication 

In "Beads and Numbers" The graphics based abacus tool will show the numbers when beads are moved alternately show the bead positions when numbers are set. 

The Simple Additions are additions simulated without complements. 
The Additions using complements are categorized into complements of each digit from 1 to 9 with respect to 10 and complements of digits from 1 to 5 with respect to 5. In both the cases, the problem set will be automatically generated. The solution steps are also automatically generated and can be viewed using forward and back tabs. During each step the instructions for the user to perform on the Abacus can be viewed below the Abacus frame where the number operations are done. Arrow marks on the Abacus frame during the transitions of the frame show the steps to solve the problem presented. Any number of problems can be generated using the reset icon. On pressing the reset icon a new problem set will be generated and shown to the user.

The app also supports tutorials on Simple Multiplication and Subtraction.

Each of the tutorials above can be generated/viewed for input numbers sizes ranging from 1 to 4 digits.

In the General Exercises section a problem which is generated automatically is presented to the user. The user can solve it using the Abacus frame shown above the problem by moving the beads one at a time. If a user wishes to move 3 beads to add the value of 3 he has to move 3 beads one at a time.
If the user solves it correctly it will be reported as 'Good Job" else it will be reported as "Wrong Answer try again". 

The app does not require an Internet connection. Once downloaded it can be used any time.
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The APP has a graphical ABACUS,tutorials on Addition,Subtraction, Multiplication

ABACUS-TUTORIALS AND EXERCISES

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