Answer:
178,920
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