Alright, let's work through 2830 times 5578 step by step
2830 × 5578 = 5578 × (2830)
+ 5578 × 0 that is equal 0
+ 5578 × 30 that equals 167340
+ 5578 × 800 that is equal 4462400
+ 5578 × 2000 that is equal 11156000

= 15785740
