Can you calculate 7÷19 in your head? Don’t worry, not many can, so you are not alone. The video below by Presh Talwakar teaches a simple method to calculate decimal expansion when dividing by the number 19.
In the video, he provides evidence that the method actually works, and it could be useful to use when dividing by 19. Presh Talwalkar has also written a great book on the topic called the “The Best Mental Math Tricks.”