We're going to solve 1247 multiplied by 3640
1247 × 3640 = 3640 × (1247)
+ 3640 × 7 resulting in 25480
+ 3640 × 40 that results in 145600
+ 3640 × 200 yielding 728000
+ 3640 × 1000 that equals 3640000

= 4539080
