A method of multiplying in which the ones tens hundreds and so on are multiplied separately and then the prodocts are added together is called the method?

The method you're referring to is known as the "partial products" method of multiplication. In this approach, each digit of the numbers being multiplied is treated separately according to its place value (ones, tens, hundreds, etc.), and the intermediate products are calculated and then summed to obtain the final result. This method helps in understanding the contribution of each digit to the overall product.