Alright, let's work through 1672 times 253 step by step
1672 × 253 = 253 × (1672)
+ 253 × 2 that is equal 506
+ 253 × 70 what gives us 17710
+ 253 × 600 what gives us 151800
+ 253 × 1000 producing 253000

= 423016
