Alright, let's work through 1639 times 9750 step by step
1639 × 9750 = 9750 × (1639)
+ 9750 × 9 producing 87750
+ 9750 × 30 yielding 292500
+ 9750 × 600 yielding 5850000
+ 9750 × 1000 yielding 9750000

= 15980250
