No problem, we've got 5158 and 7640 to multiply
5158 × 7640 = 7640 × (5158)
+ 7640 × 8 yielding 61120
+ 7640 × 50 what gives us 382000
+ 7640 × 100 that is equal 764000
+ 7640 × 5000 resulting in 38200000

= 39407120
