Alright, let's work through 1251 times 9988 step by step
1251 × 9988 = 9988 × (1251)
+ 9988 × 1 that equals 9988
+ 9988 × 50 what gives us 499400
+ 9988 × 200 which equals 1997600
+ 9988 × 1000 which equals 9988000

= 12494988
