Multiplying decimal numbers is easy. Take any two numbers, remove their decimals and then multiply them as you multiply simple numbers. Now suppose in those two numbers point was after one number each, this means in total you have two numbers after the decimal point. Mark that decimal point after leaving two numbers from the left. This is the final product. For eg.- 2.2*3.2, multiply 22&32, i.e. 22*32=704. Now in 2.2 there is only one number after decimal point and in 3.2 also one number, so leave two digits from left in 704 i.e. 7.04. This is the final product.