1. 1+1=
2. 2+1=
3. 2+2=
4. 5+1+2=
5. 5+3+1=
Level 2
1. 92+1=
2. 51+7=
3. 40+58=
4. 32+66=
5. 75+24=
Level 3
1. 443+5=
2. 606+92=
3. 275+24=
4. 677+111=
5. 223+115+501=
Level 4
2. 3109+5320=
3. 2478+2511=
4. 1724+5155=
5. 6240+203+2555=
Abacus is one of early counting devices that can be calculate for addition, subtraction, multiplication and division.
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