Question

4 digit multiplication into 4 digit multiplication math trick

Answer 1

the criss-cross multiplication technique to multiply any 4 digit numbers. As you know, the number of steps  when multiplying any 4-digit numbers  is 7.

Let us consider a simple example 3215 x 4231.

The step-by-step procedure can be explained with the following figure:

 



Notice the carry-forward in each stage of the multiplication.  I hope, The steps are self – explanatory.  Notice the additional steps compared to 2 x 2 and 3 x 3 multiplication.

Answer 2

Answer:

10,900 ten thousand nine hundred multiplication