If we want to work out some decimals of the square roots, we could broaden the table with
new pairs of 00 and then follow the instructions.
In the example given, following the instructions, the first two digits of the result, 3 and 4, indicated
that the rods that needed to be taken were the 6 and the 8, corresponding to their doubles. If the
digits in the result are higher than 4, their doubles will be a two-digit number and so will require
two rods.
If the first digit of the result was 7 and its double is 14, and we would make 14 with two rods