Aligning right to left ensures identical place values match up in the same column—units with units, tens with tens. Left alignment would mistakenly add mismatched powers of ten, yielding completely wrong sums.
Class 9 Ganita Manjari Part 2 chapter 11 The World of Algorithms solutions
Class 9 Ganita Manjari Part 2 book Solutions
Right-to-left alignment is essential because the Indian base-ten system defines places starting from the units position on the extreme right. Aligning from the right guarantees that digits representing identical powers of ten—such as units, tens and hundreds—are added together. Aligning from the left would combine different place values whenever numbers have different lengths, causing severe calculation errors and invalid place groupings.
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