Alright, let's work through 8402 times 8705 step by step
8402 × 8705 = 8705 × (8402)
+ 8705 × 2 resulting in 17410
+ 8705 × 00 what gives us 0
+ 8705 × 400 that results in 3482000
+ 8705 × 8000 that results in 69640000

= 73139410
