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Abacus = Level -2
Abacus 34 Formula(Big Friend, Small Friend and Combination)
3 Digit Addition, Subtraction- with abacus
2 Digit addition , subtraction (without abacus)
Basic-Multifaction
3 Digit Addition, Subtraction- with abacus
2 Digit addition , subtraction (without abacus)
Basic-Multifaction