No problem, we've got 9990 and 7945 to multiply
9990 × 7945 = 7945 × (9990)
+ 7945 × 0 resulting in 0
+ 7945 × 90 giving us 715050
+ 7945 × 900 which equals 7150500
+ 7945 × 9000 giving us 71505000

= 79370550
