Alright, let's work through 1855 times 1458 step by step
1855 × 1458 = 1458 × (1855)
+ 1458 × 5 producing 7290
+ 1458 × 50 what gives us 72900
+ 1458 × 800 that is equal 1166400
+ 1458 × 1000 that equals 1458000

= 2704590
