Answer:
438
Explanation:
Set it up, it is easier if you put the big number on top:
146
× 3
----------
Multiply 3 by 6 and put it under the line:
146
× 3
----------
18
Now multiply 3 by 40 and add it below the line also:
146
× 3
----------
18
120
Multiply 100 by 3 and also add it under the line:
146
× 3
----------
18
120
300
Now add 18 + 120 + 300:
146
× 3
----------
18
120
+ 300
-----------
438