We're going to solve 3947 multiplied by 1366
3947 × 1366 = 1366 × (3947)
+ 1366 × 7 that equals 9562
+ 1366 × 40 what gives us 54640
+ 1366 × 900 that equals 1229400
+ 1366 × 3000 that is equal 4098000

= 5391602
