No problem, we've got 1997 and 7643 to multiply
1997 × 7643 = 7643 × (1997)
+ 7643 × 7 giving us 53501
+ 7643 × 90 giving us 687870
+ 7643 × 900 that equals 6878700
+ 7643 × 1000 that is equal 7643000

= 15263071
