We're going to solve 3781 multiplied by 2166
3781 × 2166 = 2166 × (3781)
+ 2166 × 1 that is equal 2166
+ 2166 × 80 that equals 173280
+ 2166 × 700 what gives us 1516200
+ 2166 × 3000 that is equal 6498000

= 8189646
