"Lattice multiplication" is a calculation method of multiplying two numbers introduced by Italian mathematician pacioli in his book "An Overview of Arithmetic, Geometry and Proportional Properties" in the middle of15th century.

In the process of calculation, draw a rectangle and divide it into 3×2 cells, write down the factor and each number of the factor in turn at the edge of the cell, then divide the cell in two by diagonal, record the decimal digits and single digits of the products corresponding to the above numbers respectively, add these products from right to left along the diagonal, and move forward when they reach the decimal digits. Calculate 5*3= 15 and write it on the grid in the upper right corner, with 1 on the left and 5 on the right, and so on, and fill it in the grid; Finally, add the numbers on the same diagonal: 5 falls; 5+3+4= 12, move forward one place, and write 2 at the bottom left; 1+6+1+8+1=17, move forward one place and write 7 at the bottom left; 0+2+2+ 1=5, 5 is written in the upper left corner, and finally 1 falls in the upper left corner, so we get: 425*37= 15725.