Alright, let's work through 3342 times 5257 step by step
3342 × 5257 = 5257 × (3342)
+ 5257 × 2 which equals 10514
+ 5257 × 40 which equals 210280
+ 5257 × 300 which equals 1577100
+ 5257 × 3000 that equals 15771000

= 17568894
