No problem, we've got 6672 and 9940 to multiply
6672 × 9940 = 9940 × (6672)
+ 9940 × 2 giving us 19880
+ 9940 × 70 that equals 695800
+ 9940 × 600 resulting in 5964000
+ 9940 × 6000 which equals 59640000

= 66319680
