Alright, let's work through 3142 times 8303 step by step
3142 × 8303 = 8303 × (3142)
+ 8303 × 2 resulting in 16606
+ 8303 × 40 giving us 332120
+ 8303 × 100 which equals 830300
+ 8303 × 3000 that results in 24909000

= 26088026
