Abacua Level 1 : Now We Learn Abacus Combination Formula Subtraction
Abacus Combination Formula Subtraction is the last part of level 1 of our abacus.Till now we have covered 5 chapters of Abacus like small friend addition, small friend subtraction, big friend addition, big friend subtraction, combination addition. Today is our Abacus combination subtraction formula/trick. This formula is also a little difficult and it is difficult … Read more