Alright, let's work through 1603 times 1070 step by step
1603 × 1070 = 1070 × (1603)
+ 1070 × 3 yielding 3210
+ 1070 × 00 which equals 0
+ 1070 × 600 which equals 642000
+ 1070 × 1000 which equals 1070000

= 1715210
