We're going to solve 1666 multiplied by 1640
1666 × 1640 = 1640 × (1666)
+ 1640 × 6 resulting in 9840
+ 1640 × 60 which equals 98400
+ 1640 × 600 that equals 984000
+ 1640 × 1000 resulting in 1640000

= 2732240
