Loading
This video explains the Big Friends Formula -9, written as -9 = -10 + 1. It is an important technique in abacus subtraction used when direct subtraction is not possible.
By applying this method, students can perform calculations quickly and accurately. It strengthens mental maths ability, focus, and problem-solving skills.
What Is Abacus? Learn Basics of Maths & Mental Calculation for Kids | AbacusTrainer
Brief Introduction About Abacus Tool | What Is Abacus? Learn Basics | AbacusTrainer
Top Benefits of Learning Abacus for Kids | Boost Brain Power
Finger Abacus Explained | Learn Mental Math Techniques
Abacus Trainer brings 4+ years of expertise in Abacus and Vedic Maths, trusted by 5,000+ students and teachers. We offer online courses for children, school programs, competition conductor, teacher training, franchise support, and worksheet subscriptions, providing end-to-end solutions for both learning and teaching.
Copyright @2026 ABACUS Trainer. All Rights Reserved by Deccan Spark Technologies
Advt
