Alright, let's work through 3507 times 5381 step by step
3507 × 5381 = 5381 × (3507)
+ 5381 × 7 that equals 37667
+ 5381 × 00 that results in 0
+ 5381 × 500 what gives us 2690500
+ 5381 × 3000 what gives us 16143000

= 18871167
