We're going to solve 1998 multiplied by 7731
1998 × 7731 = 7731 × (1998)
+ 7731 × 8 what gives us 61848
+ 7731 × 90 what gives us 695790
+ 7731 × 900 resulting in 6957900
+ 7731 × 1000 resulting in 7731000

= 15446538
