- Start grouping the number in pairs from the right end. The unpaired number left in the end can be taken as a single entity. For 169, both the numbers will be grouped under one bar.
Find the largest number which, when multiplied with itself, gives 1 or a smaller number closest to 1. Here it is 1. Perform the division using 1 as the divisor.
- Bring down the next pair of numbers. Here it is 69. Multiply the quotient 1 by 2 (or add it with itself) and write it in the new divisor’s place. 2 will be the digit at ten’s place for the new divisor. 23 x 3 =69
- The quotient obtained from the long division is the square root of 169 = ±13