Alright, let's work through 9980 times 7131 step by step
9980 × 7131 = 7131 × (9980)
+ 7131 × 0 which equals 0
+ 7131 × 80 that is equal 570480
+ 7131 × 900 which equals 6417900
+ 7131 × 9000 which equals 64179000

= 71167380
