The "trick", which is taught in Japanese schools, involves drawing parallel lines to represent the digits you are multiplying ...

The first line of the calculation is the same procedure as multiplying with a single digit number. In the second line we are multiplying by \(20\) (two tens). As we are multiplying by tens the ...

In the third line we are multiplying by \(300\) (three hundreds). As we are multiplying by hundreds both the tens and unit digit will always be zero. In a similar procedure to above: \(3 \times 7 ...