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This is the last book of "Smart Maths" series, with this all concepts of addition and subtraction have been covered. Though numbers have been kept up to 99 only, but with use of these concepts three/four digit number sums can be solved.
Ms Seema Rana is an accomplished author and authority in Mental Maths. She promotes Mental Maths with Vedic, Abacus & Chisenbop concepts. She has number of books to her credit. She is also Director and Master Trainer of Smart League Education.