No problem, we've got 7100 and 1001 to multiply
7100 × 1001 = 1001 × (7100)
+ 1001 × 0 that equals 0
+ 1001 × 00 producing 0
+ 1001 × 100 what gives us 100100
+ 1001 × 7000 which equals 7007000

= 7107100
