Alright, let's work through 6306 times 8172 step by step
6306 × 8172 = 8172 × (6306)
+ 8172 × 6 giving us 49032
+ 8172 × 00 that is equal 0
+ 8172 × 300 which equals 2451600
+ 8172 × 6000 that equals 49032000

= 51532632
