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"The book is written simply so anyone can understand. The book teaches simple strategies that will enable you to make lightning calculations, multiplication, division, addition and subtraction, squaring numbers or extracting square roots and cube roots; add and subtract fraction…
"The book is written simply so anyone can understand. The book teaches simple strategies that will enable you to make lightning calculations, multiplication, division, addition and subtraction, squaring numbers or extracting square roots and cube roots; add and subtract fraction…