Alright, let's work through 6986 times 4257 step by step
6986 × 4257 = 4257 × (6986)
+ 4257 × 6 which equals 25542
+ 4257 × 80 giving us 340560
+ 4257 × 900 that equals 3831300
+ 4257 × 6000 producing 25542000

= 29739402
