No problem, we've got 6990 and 7980 to multiply
6990 × 7980 = 7980 × (6990)
+ 7980 × 0 giving us 0
+ 7980 × 90 that equals 718200
+ 7980 × 900 giving us 7182000
+ 7980 × 6000 giving us 47880000

= 55780200
