You can use area models to help you multiply large numbers. Show the problem as the area of a rectangle, and then break that rectangle into smaller chunks for easier solving. This method is also known as box multiplication.
Let's try it with First, show the problem as the area of a rectangle: Next, split the rectangle into smaller pieces for easier multiplication. Use the of 628 to keep the math simple: Next, multiply to find the area of each smaller rectangle.
Last, add those products to find the area of the original rectangle.
