Mathematics is all around sciences.It is also considered a language.In language everything should have meaning. I know addition and subtraction meaning.Same things[quantities ,etc.] can add or subtract . It cannot be done on different things. What is the meaning of multiplication and division in sciences[Physics,.. etc].I know what it means in real life.Multiplication is higher form of addition.Division is higher form of subtraction. What does F=ma means. m is in kg. a in ms-2.How can both multiply.They cannot add or subtract. Why any quantities can multiply or divide,contrary to adding and subtracting. Can anyone answer this question,or provide a book to read about this subject.