No problem, we've got 3980 and 7924 to multiply
3980 × 7924 = 7924 × (3980)
+ 7924 × 0 yielding 0
+ 7924 × 80 that equals 633920
+ 7924 × 900 what gives us 7131600
+ 7924 × 3000 what gives us 23772000

= 31537520
