Alright, let's work through 1660 times 7455 step by step
1660 × 7455 = 7455 × (1660)
+ 7455 × 0 that equals 0
+ 7455 × 60 giving us 447300
+ 7455 × 600 that is equal 4473000
+ 7455 × 1000 that equals 7455000

= 12375300
