Alright, let's work through 2220 times 7847 step by step
2220 × 7847 = 7847 × (2220)
+ 7847 × 0 that results in 0
+ 7847 × 20 yielding 156940
+ 7847 × 200 what gives us 1569400
+ 7847 × 2000 what gives us 15694000

= 17420340
