No problem, we've got 9980 and 9021 to multiply
9980 × 9021 = 9021 × (9980)
+ 9021 × 0 what gives us 0
+ 9021 × 80 that equals 721680
+ 9021 × 900 producing 8118900
+ 9021 × 9000 that is equal 81189000

= 90029580
