Alright, let's work through 1210 times 1805 step by step
1210 × 1805 = 1805 × (1210)
+ 1805 × 0 giving us 0
+ 1805 × 10 that is equal 18050
+ 1805 × 200 which equals 361000
+ 1805 × 1000 that equals 1805000

= 2184050
