Detailed Explanation: If
a number is less than 50, then the question is how much it is less than 50? Difference is taken. As for example, in the square of 49; 41 is 1 less than 50, thus
1 is subtracted from 49, so that it becomes 49 - 1 = 48.
We take always half of
the total, i. e. half of 48, which is 24. We read always 24 hundred and square
of 1. That is, 2600 + 01 = 2601
Similarly, in the square
of 48; 48 is 2 less than 50, thus 2 is subtracted from 48, so that it becomes 48 - 2 = 46.
We take always half of
the total, i. e. half of 46, which is 23. We read always 23 hundred and square
of 2. That is, 2300 + 04 = 2304. and so on.
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