No problem, we've got 9240 and 9680 to multiply
9240 × 9680 = 9680 × (9240)
+ 9680 × 0 that is equal 0
+ 9680 × 40 what gives us 387200
+ 9680 × 200 yielding 1936000
+ 9680 × 9000 that is equal 87120000

= 89443200
