No problem, we've got 1420 and 3129 to multiply
1420 × 3129 = 3129 × (1420)
+ 3129 × 0 which equals 0
+ 3129 × 20 which equals 62580
+ 3129 × 400 that equals 1251600
+ 3129 × 1000 resulting in 3129000

= 4443180
