Alright, let's work through 8320 times 7639 step by step
8320 × 7639 = 7639 × (8320)
+ 7639 × 0 resulting in 0
+ 7639 × 20 that is equal 152780
+ 7639 × 300 that results in 2291700
+ 7639 × 8000 that results in 61112000

= 63556480
