Nikhilam Multiplication is specifically used when the numbers that are to be multiplied together are close to a particular base such as 10, 100, 1000 etc.
The Nikhilam series of examples has been arranged into 5 separate sections and there are many short videos arranged in order of increasing complexity given below.
General Theory/Explanation of Nikhilam Multiplication(Download PDF Part I)
General Theory/Explanation of Nikhilam Multiplication(Download PDF Part II)
General Theory/Explanation of Nikhilam Multiplication(Download PDF Part III)
General Theory/Explanation of Nikhilam Multiplication(Download PDF Part IV)
General Theory/Explanation of Nikhilam Multiplication(Download PDF Part V)