Alright, let's work through 3450 times 7080 step by step
3450 × 7080 = 7080 × (3450)
+ 7080 × 0 that is equal 0
+ 7080 × 50 producing 354000
+ 7080 × 400 resulting in 2832000
+ 7080 × 3000 which equals 21240000

= 24426000
