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Group the digits in the given number - 2 digits by two digits from units side towards the most significant digit (highest digit). Now find X so that X * X <= 53. So X = 7. This is highest but X^2 < 53. Write 7 above 53 and on the left side. Now multiply 7 * 7 and write it below 53. subtract. Now, import 28 to right side of 4. Write two times 7 (from above top of 53) to the left of 428. Find a digit N such that (140+N) * N <= 428. Here i find 2 that is, 142*2 = 284. but 143*3=429 which is more than 428. Now subtract 284 from 428. Write a decimal place on the number on top. Repeat the procedure by importing 00. Write twice 72 to left of 14400. find X such that (144*10+X ) X <= 14400