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English || level-1 || Abacus classes || Test || Big friend and small friend concept ||

Learn Big Friend Addition Formula (+9 = +10 - 1)🤩|When & how to use (+9 = +10 - 1)🥰|Level 1 abacus 👆

Learn the big friend concept in abacus🤩 | What are the conditions for applying big friend Formulae

Abacus Tutorials | Lesson - Formula In Big Friend | Abacus Classes
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Last Updated: August 19, 2026
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