Make a logical calculation like a child divide 12÷5. Consider a longer digit 123456÷54321 and start with len function, this will enable you to identify that there are two folfs of 54321 in 123456. So seperate each digit of 54321 and multiply each with 2 (keep 10th adding to the next level). Now index the result and subtract from the index of 123456 individual digits. Make a program for 12÷5 and you will be able to divide large numbers upto google numbers and above.