How to break down three digit multiplication 420 ×426

178,920

Step-by-step explanation:

The trick is both the set up and keeping your columns in line

           1

           4 2 0

     x    4 2 6

        2 4 2 0  multiply 6 by each number on top, carry the 1 over

        8 4 0 0  use left zero as place holder and multiply each # by 6

+ 1 6 8 0 0 0  use left 2 zeroes as place holders and multiply each # by 4

   1 7 8,9 2 0  add all the columns up to get your answer

the solution is h=10 because you add 9 to each side of the equation.