1. 7-4=
2. 5-2=
3. 8-4=
4. 6-3=
5. 6-2=
6. 5-1=
7. 9-2-3=
8. 9-4-1=
9. 8-3-3=
10. 7-2-4=
Abacus is one of early counting devices that can be calculate for addition, subtraction, multiplication and division.
Abacus is one of early counting devices that can be calculate for addition, subtraction, multiplication and division.
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