Alright, let's work through 1688 times 894 step by step
1688 × 894 = 894 × (1688)
+ 894 × 8 which equals 7152
+ 894 × 80 that is equal 71520
+ 894 × 600 that equals 536400
+ 894 × 1000 what gives us 894000

= 1509072
