Let's calculate 1644 x 2743
1644 × 2743 = 2743 × (1644)
+ 2743 × 4 that is equal 10972
+ 2743 × 40 that is equal 109720
+ 2743 × 600 which equals 1645800
+ 2743 × 1000 what gives us 2743000

= 4509492
