No problem, we've got 6441 and 7640 to multiply
6441 × 7640 = 7640 × (6441)
+ 7640 × 1 producing 7640
+ 7640 × 40 producing 305600
+ 7640 × 400 that results in 3056000
+ 7640 × 6000 that is equal 45840000

= 49209240
