Alright, let's work through 3985 times 7829 step by step
3985 × 7829 = 7829 × (3985)
+ 7829 × 5 that equals 39145
+ 7829 × 80 what gives us 626320
+ 7829 × 900 that equals 7046100
+ 7829 × 3000 giving us 23487000

= 31198565
